| 摘要 |
PROBLEM TO BE SOLVED: To improve precision of retrieval of a large quantity of text documents by input of a text. SOLUTION: A method for document retrieval includes a step of extracting a scale expression word from an input text by referring to a set of scale expression words as words representing attribute having a quantitative value, and of extracting, as a scale expression related word, a word corresponding to one of: a word which is contiguous to the extracted scale expression word to form a compound word; a word modifying the extracted scale expression word; and a word that a phrase including the extracted scale expression word includes modifies. When the weight of a keyword is imparted, a weight calculated on the basis of a previously set calculating method is imparted to the scale expression word or scale expression related word. COPYRIGHT: (C)2006,JPO&NCIPI
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