| 摘要 |
A device comprises input means (1) for inputting a document (d) to be examined, a group of documents (P) to be compared, and a group of similar documents (S), index word extracting means (120) for extracting an index word in the document (d), first frequency calculating means (143) for calculating ln GFIDF(P) of the extracted index word in the document group (P), second frequency calculating means (171) for calculating ln GFIDF(S) of the extracted index word in the similar document group (S), and output means (4) for outputting the index words and their positioning data according to the combination of the calculated ln GFIDF(P) and ln GFIDF(S) in the document group to be compared and the similar document group. With this, when a document to be examined is given, the assertion of the document can be easily grasped.
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