| 摘要 |
<P>PROBLEM TO BE SOLVED: To retrieve a document data while appropriately reflecting the content of a retrieving sentence, and to appropriately detect the occurrence of a problem out of document data sequentially added. Ž<P>SOLUTION: This retrieval system retrieves the document data including the content of the retrieving sentence from the plurality of document data, and includes a document database for storing the plurality of document data, a concept database for storing a plurality of concepts by hierarchical structure, a document data concept extraction part for extracting document concept corresponding to document data, based on a keyword included in each document data, a retrieving sentence concept extraction part for extracting a retrieving sentence concept, based on the keyword included in the retrieving sentence, a concept retrieval part for retrieving the document data with the retrieving sentence concept serving as an upper hierarchy or lower hierarchy of the document concept, out of the plurality of document data, and a retrieval result output part for outputting the document data retrieved by the concept retrieval part, as the document data including the content assigned by the retrieving sentence. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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