| 摘要 |
The retrieval request input means 110 reads a retrieval request consisting of input keywords set up by the user as well as their importance degrees. The retrieval management section 120 causes the relation keyword generation section 121 and the retrieval expression generation section 122 to generate a retrieval expression by using background knowledge and retrieval parameters. The retrieval management section 120 causes the database management section to retrieve data from the database 160 based on a generated retrieval expression, causes the relation data acquisition section 124 to present a temporary retrieval result to the user, and causes the relevance database management section 123 to store user-instructed relation data into the relevance database 150. The retrieval management section 120 changes the retrieval parameters based on this relation data, causes the retrieval expression generation section 122 to generate a mew retrieval expression, and causes the database management section 125 to retrieve data again. The retrieval result output section 130 outputs the final retrieval result. Thus, this system allows the user to reflect his retrieval strategy and background knowledge about data easily and precisely and to execute similarity retrieval efficiently on a trial and error basis, without a substantial increase in the retrieval time.
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