Patent ID: 7359896

Claim:
An information retrieving system comprising: a data registration section in which a keyword and an attribute of the keyword are extracted from a source document; a database where a keyword and an attribute of the keyword are stored together with a document ID for discriminating the source document; a retrieval key input section which captures at least one keyword; an attribute rule registration section where a pair of an attribute keyword and the attribute of the attribute keyword is registered, the attribute keyword being defined as a keyword whose attribute is used for retrieval; a keyword conversion section which converts a keyword captured from said retrieval key input section into an attribute corresponding to the attribute keyword if the keyword is an attribute keyword registered in said attribute rule registration section; a retrieval section which retrieves information from the database on the basis of captured keywords and attributes converted from keywords by said keyword conversion section; an output section which outputs a retrieval result obtained by the retrieval section; and a computer for processing information in the above-mentioned sections wherein the data registration section comprises: a document input section which captures an electronic document serving as a source of data to be registered in the database; a keyword extraction section which extracts a keyword from the electronic document captured by the document input section; an attribute giving section which gives an attribute to the keyword extracted by the keyword extraction section; and a registration section which registers a correspondence of the keyword extracted by the keyword extraction section to the attribute given by the attribute giving section in the database together with a document ID unique to the electronic document.