| 摘要 |
A document retrieval system with program storage device and computer program product capable of providing excellent capabilities of accurate document retrieval even using plural indices, to thereby attain the accuracy as high as that for a single index previously employed. The document retrieval system is provided with an index section for storing and managing plural indices which are each generated for respective groups of documents divided to be currently retrieved. A retrieval condition analyzing section is provided for analyzing acquired retrieval conditions, dividing a retrieval character string contained in the retrieval conditions into index units, and representing the retrieval conditions in terms of a predetermined internal representation for each index. A TF computing section, a DF computing section, and a DF term computing section are provided for specifying the documents corresponding to the retrieval conditions. A merging section is used to merge retrieval results obtained for each index and to generate final retrieval results.
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