| 摘要 |
PROBLEM TO BE SOLVED: To improve document retrieval processing if a retrieval condition includes at least numerical information. SOLUTION: The document retrieval system comprises a numerical information classification means classifying one or more pieces of numerical information extracted from an input document for each unit kind of numerical information; a characteristic quantity calculation means calculating a characteristic quantity for estimating a document including numerical information in a predetermined numerical range for each unit kind; a characteristic quantity storage means storing the characteristic quantity calculated by the calculation means for each unit kind; a numerical importance calculation means acquiring, based on a unit kind of input numerical information inputted as a retrieval condition, the characteristic quantity of the corresponding unit kind from the characteristic quantity storage means and calculating, based on at least the acquired characteristic quantity, the weight of the input numerical information inputted as the retrieval condition; and a document retrieval means retrieving, based on the weight of input numerical information calculated by the numerical importance calculation means, a document from registered documents. COPYRIGHT: (C)2007,JPO&INPIT
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