| 摘要 |
PROBLEM TO BE SOLVED: To provide an information retrieval method, a system therefor and a computer program, allowing retrieval of co-occurrence expression included in a desired document by the keyword retrieval in a bird's eye view without previously producing a dictionary or a pattern, without classifying documents. SOLUTION: The document present in a document set database is retrieved by a query word as a retrieval keyword, a word present on the periphery of the query word is extracted in the document as a co-occurrence word, the document present in the document set database is retrieved, the number of the documents each including only the query word, the number of the documents each including only the co-occurrence word, and the number of the documents each including both the query word and the co-occurrence word are acquired, a relevance degree between the query word and the co-occurrence word is calculated on the basis of the acquired number of the documents, and a phrase and a sentence including both the query word and an important co-occurrence word are extracted from the document set database with the co-occurrence word wherein the relevance degree is present within a prescribed range as the important co-occurrence word, and are exhibited in each the important co-occurrence word as the co-occurrence expression. COPYRIGHT: (C)2006,JPO&NCIPI
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