A meta-search engine based on quotient space

World Wide Web has developed to an Inherently distributed information system, which brings people great trouble in finding needed information although huge amount of information available on the webs. The search engine is a very important tool for people to obtain information on the webs, but the low-precision and low-recall exist widely in Current search engines. The effective and accurate intelligent search engine based on the expert systems technology has become the most important research issue. This paper analyzes the WWW with different granularities according to quotient space theory, gives summarization of search engine and describes an expert system built by Visual Prolog.