Importance

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Abstract

A searching apparatus includes an index generation portion for generating an index to provide data of the number of documents including the key word and the number of appearances of the key word. Matching degrees between the key word and documents are calculated from the number of documents including the key word and the number of appearances of the key word. A portion of documents are arranged in order of the matching degree in a buffer which are outputted as the searching result. Lower rank documents regarding the matching degree are searched by comparing the lowest matching degree of the neighbour higher ranked document arranged in the buffer. At first time searching, data of the latest edition of the documents stored in a memory is detected and stored and is used to provide second time searching operation to eliminate inconsistency in the searching result between the editions at first and second time searching operations. The index is generated every field of each document. The matching degree of combined field is calculated by logical operation between the two fields. Moreover, an index of combined field may be generated and one of field of the combined field may be omitted. The matching degree of the other field is also obtained by another logical operation.

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First Claim