| 摘要 |
PROBLEM TO BE SOLVED: To retrieve a similar document with high precision by retrieving a document based on first words and phrases extracted from a main configuration element, the second ones extracted from the configuration element except the first one and a retrieval request. SOLUTION: Before retrieving the similar document, a control part 202 creates an index by extracting the words and phrases of a patent specification from a document storing part 211 by an index creating part 204. In this case, a basic word extracting part 206 extracts the index words and phrases from the sentence of a 'patent demand range' in the specification by morpheme analysis. An extension word extracting part 207 takes out the sentence of an 'invention executing form', extracts the words and phrases extending the index words and phrases and stores it in an index storing part 209. When the patent specification being an object is inputted, a document retrieving part 208 refers to the words and phrases extracted from the specification and the stored index and calculates a similarity degree between the specification and each document stored in the storing part 209. The control part 202 shows the specification list with a high similarity degree to the user from an output part 201.
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