| 摘要 |
PROBLEM TO BE SOLVED: To more efficiently retrieve a keyword used with high frequency in a text satisfying predetermined conditions than a conventional manner. SOLUTION: This system is stored with a first index for designating the list of keywords included in a text from the identification information of each text, a second index for designating the list of texts including the keywords from the identification information of each keyword and the number of texts including each keyword. Then, when accepting the input of text retrieval conditions, the estimation of a retrieval time based on the first index and the estimation of a retrieval time based on the second index are calculated, and which of the first index and the second index should be used for achieving much quicker retrieval is determined. Then, the keywords appearing with high frequency are retrieved based on the index determined to be used for quicker retrieval in the text satisfying the text retrieval conditions. COPYRIGHT: (C)2007,JPO&INPIT
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