To provide a document retrieval device with a small ratio of noise occupying a retrieval result.
This document retrieval device 1 comprises an input means 10, a primary extraction means 30, a similarity degree calculation means 40, a secondary extraction means 50, and an output means 60. The input means 10 is for inputting logical retrieval conditions and a reference document. The primary extraction means 30 extracts documents which satisfy the logical retrieval conditions from documents to be retrieved. The similarity degree calculation means 40 calculates degrees of similarity representing degrees which are similar to the reference document about each of the documents extracted by the primary extraction means 30. The secondary extraction means 50 extracts documents having the similarity degrees equal to or more than a reference value from the documents extracted by the primary extraction means 30. The output means 60 outputs an extraction result by the secondary extraction means 50.
Tatsuya Shioda
Shiro Terasaki
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