| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to retrieve documents at high reproducibility even in the case of retrieving plural documents having respectively different logical structures. SOLUTION: When a retrieval expression 1 is inputted, a retrieval expression generating means 2 rewrites retrieving conditions indicated in the expression to stepwisely moderate conditions and generates a condition eased retrieval expression 4. An accuracy calculating means 3 calculates accuracy indicating the accuracy of a retrieval result based on the expression 4 in accordance with the rewritten condition executed for the formation of each expression 4. A retrieval execution means 5 retrieves structured documents stored in a document storing means 6 based on the inputted retrieval expression 1 and the retrieval expression 4 generated by the means 2. A retrieved result merging means 7 merges retrieved results by arranging them in order from the result having the highest accuracy. Consequently a document of which logical structure is not correctly prepared can also be retrieved and the reproducibility of documents can be improved. |
