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Abstract

A structured document used for exemplifying a retrieved result is analyzed by a structure analyzing section, and its structure is expanded in a memory. A search-formula structure extracting section consecutively fetches fixed-type structural patterns stored in a knowledge base, and finds a structural pattern including a substructure of the structured document exemplified by the user. A search-condition extracting section determines a value of a field used for a search formula with respect to each of the records contained in the substructure extracted by the search-formula structure extracting section. A search-formula synthesizing section synthesizes an expression in a form which can be recognized as a search formula. The synthesized search formula can be modified by a search-formula editing section in compliance with an edit instruction from the user on condition that the exemplified substructure is retrievable.

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First Claim