| 摘要 |
PROBLEM TO BE SOLVED: To execute search, and to improve ranking accuracy based on a query-expanded search expression based on an expanded word included in an expanded word candidate list. SOLUTION: A request including an input query is created, and the request is output (110). An expanded word candidate list sequenced by weights is generated according to the query included in the output request, and the expanded word is selected based on the expanded word candidate list (120). The query-expanded search expression is generated based on the selected expanded word (110). search is executed based on the generated search expression, and a network is searched, and the search result is acquired (130). The neighborhood for the number of specific morphemes with the query as a center is extracted with respect with the body of a document shown by the acquired search result, and when the expanded words are included in the neighborhood, those expanded words are scored with the weights corresponding to expanded word candidates in the expanded word candidate list, and the search results rearranged based on the scores are output (140). COPYRIGHT: (C)2009,JPO&INPIT
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