PROBLEM TO BE SOLVED: To provide a related word dictionary creation system, a related word dictionary creation method and a related word dictionary creation program for efficiently creating a related word dictionary. A management system 20 includes a control unit 21 that identifies a related word set in a document set composed of a plurality of documents, and a dictionary storage unit 24 that records the related word set. The control unit 21 generates a sub-document group composed of documents having a sampled number of documents from a plurality of documents constituting the document set, and in each of the sub-document groups, a word set is used using the words included in the sub-document group. Is generated, the appearance rate is calculated according to the number of documents in which the word set appears, and in each of the sub-document groups, each word set specified according to the appearance rate is recorded in the dictionary storage unit 24 as a related word set. To do. [Selection diagram] Fig. 1
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