| 摘要 |
PROBLEM TO BE SOLVED: To provide an information retrieval device with high retrieval precision and high reproducibility for retrieving information relevant to a concept expressed with an inputted word. SOLUTION: An information retrieval device 100 is provided with a word extending part 106 which collects an extended word having a hierarchical relation on concept with an input word shown by a character string acquired by a character string acquiring part 102 from a concept dictionary storing part 104, a data retrieval part 110 for retrieving a keyword matched with an extended retrieval key, which is constituted of the input word and the extended word, from a database 108, a rank calculation part 114 which decides the priority order of the retrieved information by using the similarity of the attributes of the input word and the attributes of the keyword matched with the extended retrieval key as a reference and a data selection part 116 which selects information to be outputted according to the priority order decided by the rank calculation part 114, and makes an output part 118 output the information. COPYRIGHT: (C)2005,JPO&NCIPI
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