{"id":1771,"date":"2026-04-01T18:26:34","date_gmt":"2026-04-01T18:26:34","guid":{"rendered":"https:\/\/www.viz-note.com\/ja\/data-flow-diagrams-vs-entity-relationship-diagrams\/"},"modified":"2026-04-01T18:26:34","modified_gmt":"2026-04-01T18:26:34","slug":"data-flow-diagrams-vs-entity-relationship-diagrams","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/ja\/data-flow-diagrams-vs-entity-relationship-diagrams\/","title":{"rendered":"\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff1a\u4e3b\u306a\u9055\u3044"},"content":{"rendered":"<p>\u60c5\u5831\u30b7\u30b9\u30c6\u30e0\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306b\u304a\u3044\u3066\u3001\u660e\u78ba\u3055\u304c\u4fa1\u5024\u3067\u3042\u308b\u3002\u30b7\u30b9\u30c6\u30e0\u5206\u6790\u304a\u3088\u3073\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306e\u5206\u91ce\u3092\u652f\u914d\u3059\u308b2\u3064\u306e\u57fa\u76e4\u7684\u306a\u30c4\u30fc\u30eb\u304c\u5b58\u5728\u3059\u308b\uff1a\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\uff08DFD\uff09\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u3002\u4e21\u8005\u3068\u3082\u8907\u96d1\u306a\u30b7\u30b9\u30c6\u30e0\u3092\u53ef\u8996\u5316\u3059\u308b\u76ee\u7684\u3092\u6301\u3064\u304c\u3001\u6839\u672c\u7684\u306b\u7570\u306a\u308b\u62bd\u8c61\u5316\u306e\u30ec\u30d9\u30eb\u3067\u52d5\u4f5c\u3059\u308b\u3002\u4e00\u65b9\u306f\u79fb\u52d5\u3068\u5909\u63db\u306b\u6ce8\u76ee\u3057\u3001\u4ed6\u65b9\u306f\u69cb\u9020\u3068\u4fdd\u5b58\u306b\u6ce8\u76ee\u3059\u308b\u3002\u3053\u308c\u3089\u3092\u6df7\u540c\u3059\u308b\u3068\u3001\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u4e0a\u306e\u5931\u6557\u3084\u30c7\u30fc\u30bf\u306e\u4e0d\u6574\u5408\u3001\u30d7\u30ed\u30bb\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u751f\u3058\u308b\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30e2\u30c7\u30ea\u30f3\u30b0\u6280\u6cd5\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3001\u5fdc\u7528\u3001\u304a\u3088\u3073\u9055\u3044\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3059\u308b\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Line art infographic comparing Data Flow Diagrams (DFD) and Entity Relationship Diagrams (ERD) for system design. Left side shows DFD components: processes, data stores, external entities, and data flows with hierarchical levels. Right side displays ERD elements: entities, attributes, relationships, and cardinality notation. Center comparison table highlights key differences: process vs structure focus, dynamic vs static time dimension, target audiences, and storage handling. Bottom sections list optimal use cases for each diagram type and common pitfalls to avoid. Clean black-and-white technical illustration style, 16:9 aspect ratio, educational reference for software architects and database designers.\" decoding=\"async\" src=\"https:\/\/www.viz-note.com\/wp-content\/uploads\/2026\/03\/dfd-vs-erd-comparison-infographic-line-art.jpg\"\/><\/figure>\n<\/div>\n<h2>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u306e\u7406\u89e3 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3092\u7d30\u304b\u3044\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u3055\u3089\u306b\u5206\u89e3\u3059\u308b\u3002\u3053\u306e\u30ec\u30d9\u30eb\u306f\u8a73\u7d30\u306a\u4ed5\u69d8\u5b9a\u7fa9\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002<\/li>\n<\/ul>\n<h2>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u306e\u7406\u89e3 \ud83d\uddc3\ufe0f<\/h2>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u306f\u3001\u30c7\u30fc\u30bf\u306e\u9759\u7684\u69cb\u9020\u306b\u6ce8\u76ee\u3059\u308b\u3002\u3053\u308c\u306f\u4e3b\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u6bb5\u968e\u3067\u4f7f\u7528\u3055\u308c\u308b\u6982\u5ff5\u30e2\u30c7\u30eb\u3067\u3042\u308b\u3002\u76ee\u7684\u306f\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u78ba\u4fdd\u3057\u3001\u5197\u9577\u6027\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3001\u7570\u306a\u308b\u60c5\u5831\u306e\u9593\u306e\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3042\u308b\u3002<\/p>\n<h3>ERD\u306e\u6838\u5fc3\u7684\u306a\u69cb\u6210\u8981\u7d20<\/h3>\n<p>ERD\u306f\u3001\u30c7\u30fc\u30bf\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u4e92\u3044\u306b\u3069\u306e\u3088\u3046\u306b\u95a2\u4fc2\u3059\u308b\u304b\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u7279\u5b9a\u306e\u8a18\u6cd5\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>\u9577\u65b9\u5f62\u3067\u8868\u3055\u308c\u308b\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u306f\u3001\u30c7\u30fc\u30bf\u304c\u683c\u7d0d\u3055\u308c\u308b\u5bfe\u8c61\u3068\u306a\u308b\u73fe\u5b9f\u4e16\u754c\u306e\u7269\u4f53\u307e\u305f\u306f\u6982\u5ff5\u3067\u3042\u308b\u3002\u4f8b\u3068\u3057\u3066\u300c\u9867\u5ba2\u300d\u3001\u300c\u88fd\u54c1\u300d\u3001\u300c\u6ce8\u6587\u300d\u306a\u3069\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u5c5e\u6027\uff1a<\/strong>\u6955\u5186\u3067\u8868\u3055\u308c\u308b\u304b\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u9577\u65b9\u5f62\u5185\u306b\u8a18\u8f09\u3055\u308c\u308b\u3002\u3053\u308c\u3089\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6027\u8cea\u3092\u8aac\u660e\u3059\u308b\u3002\u305f\u3068\u3048\u3070\u300c\u9867\u5ba2\u300d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5834\u5408\u3001\u5c5e\u6027\u306b\u306f\u300c\u540d\u524d\u300d\u3001\u300c\u4f4f\u6240\u300d\u3001\u300c\u96fb\u8a71\u756a\u53f7\u300d\u306a\u3069\u304c\u542b\u307e\u308c\u308b\u3002<\/li>\n<li><strong>\u95a2\u4fc2:<\/strong>\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u307e\u305f\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7d50\u3076\u7dda\u3067\u8868\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u9867\u5ba2\u304c\u6ce8\u6587\u3092\u300c\u4f5c\u6210\u3059\u308b\u300d\u3068\u3044\u3046\u95a2\u4fc2\u3067\u3059\u3002<\/li>\n<li><strong>\u57fa\u6570:<\/strong>\u95a2\u4fc2\u306e\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u30021\u5bfe1\u3067\u3059\u304b\uff1f1\u5bfe\u591a\u3067\u3059\u304b\uff1f\u591a\u5bfe\u591a\u3067\u3059\u304b\uff1f\u3053\u308c\u306b\u3088\u308a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u9020\u7684\u5236\u7d04\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>ERD\u8a2d\u8a08\u306b\u304a\u3051\u308b\u6b63\u898f\u5316<\/h3>\n<p>DFD\u306f\u901a\u5e38\u3001\u6b63\u898f\u5316\u3092\u6271\u3044\u307e\u305b\u3093\u304c\u3001ERD\u306f\u3053\u308c\u3068\u6df1\u304f\u7d50\u3073\u3064\u3044\u3066\u3044\u307e\u3059\u3002\u8a2d\u8a08\u30d7\u30ed\u30bb\u30b9\u3067\u306f\u3001\u91cd\u8907\u3092\u6e1b\u3089\u3059\u305f\u3081\u306b\u30c7\u30fc\u30bf\u3092\u6574\u7406\u3057\u307e\u3059\u3002ERD\u306f\u7b2c\u4e00\u6b63\u898f\u5f62\u3001\u7b2c\u4e8c\u6b63\u898f\u5f62\u306a\u3069\u3001\u5404\u6b63\u898f\u5316\u898f\u5247\u3092\u53cd\u6620\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7d50\u679c\u3068\u3057\u3066\u5f97\u3089\u308c\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u52b9\u7387\u7684\u3067\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u306b\u306a\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u6b63\u898f\u5316\u3057\u306a\u3044\u3068\u30011\u3064\u306e\u60c5\u5831\u306e\u5909\u66f4\u304c\u8907\u6570\u306e\u5834\u6240\u3067\u7de8\u96c6\u3092\u5fc5\u8981\u3068\u3059\u308b\u66f4\u65b0\u7570\u5e38\u304c\u767a\u751f\u3059\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u69cb\u9020\u7684\u6bd4\u8f03\uff1aDFD\u5bfeERD \ud83d\udcca<\/h2>\n<p>\u9055\u3044\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u4e21\u30e2\u30c7\u30eb\u3092\u8907\u6570\u306e\u6b21\u5143\u3067\u6bd4\u8f03\u3057\u307e\u3059\u3002\u3053\u306e\u8868\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u30d5\u30ed\u30fc\u3068\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9593\u306e\u6a5f\u80fd\u7684\u9055\u3044\u3092\u5f37\u8abf\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<table>\n<tr>\n<th><strong>\u6a5f\u80fd<\/strong><\/th>\n<th><strong>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\uff08DFD\uff09<\/strong><\/th>\n<th><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09<\/strong><\/th>\n<\/tr>\n<tr>\n<td><strong>\u4e3b\u306a\u7126\u70b9<\/strong><\/td>\n<td>\u30d7\u30ed\u30bb\u30b9\u3068\u79fb\u52d5<\/td>\n<td>\u69cb\u9020\u3068\u4fdd\u5b58<\/td>\n<\/tr>\n<tr>\n<td><strong>\u6642\u9593\u6b21\u5143<\/strong><\/td>\n<td>\u52d5\u7684\uff08\u30a4\u30d9\u30f3\u30c8\u306e\u9806\u5e8f\uff09<\/td>\n<td>\u9759\u7684\uff08\u30c7\u30fc\u30bf\u306e\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\uff09<\/td>\n<\/tr>\n<tr>\n<td><strong>\u6838\u5fc3\u7684\u306a\u8cea\u554f<\/strong><\/td>\n<td>\u30c7\u30fc\u30bf\u306f\u3069\u306e\u3088\u3046\u306b\u5909\u5316\u3059\u308b\u304b\uff1f<\/td>\n<td>\u3069\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u304b\uff1f<\/td>\n<\/tr>\n<tr>\n<td><strong>\u5bfe\u8c61\u8aad\u8005<\/strong><\/td>\n<td>\u30d3\u30b8\u30cd\u30b9\u30a2\u30ca\u30ea\u30b9\u30c8\u3001\u30e6\u30fc\u30b6\u30fc<\/td>\n<td>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u8005\u3001\u958b\u767a\u8005<\/td>\n<\/tr>\n<tr>\n<td><strong>\u4fdd\u5b58\u306e\u53d6\u308a\u6271\u3044<\/strong><\/td>\n<td>\u4e00\u822c\u7684\u306a\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2<\/td>\n<td>\u7279\u5b9a\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u30ad\u30fc<\/td>\n<\/tr>\n<tr>\n<td><strong>\u8ad6\u7406\u306e\u8868\u73fe<\/strong><\/td>\n<td>\u5909\u63db\u3068\u8ad6\u7406<\/td>\n<td>\u5236\u7d04\u3068\u30eb\u30fc\u30eb<\/td>\n<\/tr>\n<\/table>\n<h2>\u5404\u56f3\u306e\u5c55\u958b\u6642\u671f \ud83d\udcc5<\/h2>\n<p>\u9069\u5207\u306a\u30c4\u30fc\u30eb\u3092\u9078\u3076\u3053\u3068\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306e\u6bb5\u968e\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306b\u30d3\u30b8\u30cd\u30b9\u30d7\u30ed\u30bb\u30b9\u3092\u8aac\u660e\u3059\u308b\u305f\u3081\u306bERD\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6df7\u4e71\u3092\u62db\u304d\u307e\u3059\u3002\u958b\u767a\u8005\u306b\u30c6\u30fc\u30d6\u30eb\u306e\u95a2\u4fc2\u3092\u8aac\u660e\u3059\u308b\u305f\u3081\u306bDFD\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a4\u30e9\u30a4\u30e9\u3055\u305b\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u6700\u9069\u306a\u4f7f\u7528\u30b7\u30ca\u30ea\u30aa\u306e\u6982\u8981\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<h3>\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u306fDFD\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/h3>\n<ul>\n<li><strong>\u30b7\u30b9\u30c6\u30e0\u7bc4\u56f2\u306e\u5b9a\u7fa9\uff1a<\/strong> \u30b7\u30b9\u30c6\u30e0\u5185\u90e8\u3068\u5916\u90e8\u306e\u9055\u3044\u3092\u793a\u3059\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002<\/li>\n<li><strong>\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306e\u5206\u6790\uff1a<\/strong> \u30ea\u30af\u30a8\u30b9\u30c8\u304c\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u304b\u3089\u4fdd\u5b58\u3055\u308c\u305f\u30ec\u30b3\u30fc\u30c9\u3078\u3068\u3069\u306e\u3088\u3046\u306b\u79fb\u52d5\u3059\u308b\u304b\u3092\u8ffd\u8de1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002<\/li>\n<li><strong>\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306e\u7279\u5b9a\uff1a<\/strong> \u30c7\u30fc\u30bf\u304c\u84c4\u7a4d\u3055\u308c\u308b\u5834\u6240\u3084\u30d7\u30ed\u30bb\u30b9\u304c\u505c\u6b62\u3059\u308b\u5834\u6240\u3092\u628a\u63e1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002<\/li>\n<li><strong>\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u3068\u306e\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\uff1a<\/strong> \u975e\u6280\u8853\u8005\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u30d5\u30ed\u30fc\u306e\u7406\u89e3\u306e\u65b9\u304c\u30c6\u30fc\u30d6\u30eb\u3088\u308a\u3082\u5f97\u610f\u3067\u3059\u3002<\/li>\n<\/ul>\n<h3>\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u306fERD\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/h3>\n<ul>\n<li><strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u8a2d\u8a08\uff1a<\/strong> \u7269\u7406\u7684\u307e\u305f\u306f\u8ad6\u7406\u7684\u306a\u30b9\u30c8\u30ec\u30fc\u30b8\u30ec\u30a4\u30e4\u30fc\u3092\u69cb\u7bc9\u3057\u3066\u3044\u308b\u5834\u5408\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u78ba\u4fdd\uff1a<\/strong> \u4e3b\u30ad\u30fc\u3001\u5916\u90e8\u30ad\u30fc\u3001\u5236\u7d04\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002<\/li>\n<li><strong>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306e\u8a08\u753b\uff1a<\/strong> \u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304c\u5197\u9577\u6027\u3092\u4f34\u308f\u305a\u306b\u5c06\u6765\u306e\u6210\u9577\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u3092\u78ba\u5b9f\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002<\/li>\n<li><strong>API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u4f5c\u6210\uff1a<\/strong> \u5916\u90e8\u5229\u7528\u8005\u306b\u516c\u958b\u3055\u308c\u308b\u30b9\u30ad\u30fc\u30de\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002<\/li>\n<\/ul>\n<h2>\u30b9\u30af\u30e9\u30c3\u30c1\u304b\u3089\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u3092\u69cb\u7bc9\u3059\u308b 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