| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that it is difficult for a conventional apparatus for document retrieval to select a searching word to efficiently narrow a search. SOLUTION: An apparatus for document retrieval comprises a document retrieval part 2 to search documents, a document feature extracting part 4 to output a document vector group 5, a topic classifying part 6 to prepare a topic by classifying the group 5, a narrowing effect presumption part 10 to calculate narrowing effect indicator 11,a generating part 8 for choice of retrieving word for provision to select the retrieval word with high indicator 11 and output it as a candidate of retrieval word 12 for provision, a classifying result providing part 14 to provide the candidate 12 and indicator 11 topic-by topic and a document feature setting part 20 to change the group 5.
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