DOCUMENT RETRIEVAL DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To solve ambiguity of a multisense word without using data requiring manual maintenance.

SOLUTION: A co-occurrence information file 44 stores co-occurrence information expressing co-occurrence relation between a plurality of words. A context specification part 53 collates a retrieval target word that is a target of retrieval included in a retrieval condition designated by a retrieval request from a user and the co-occurrence information stored in the co-occurrence information file 44 to extract a set of the retrieval target words having the co-occurrence relation as a co-occurrence word group. A word development result file 45 stores a past word development result obtained by performing word development to a related word or a synonym of the retrieval target word. A word development part 54 acquires the word development result including the extracted co-occurrence word group from the word development result file 45, and develops the retrieval target word included in the retrieval condition designated by the retrieval request such that it includes the word development result. A similar document retrieval part 55 performs document retrieval based on a new word development result.

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