Binary Information Press
In practical applications of information retrieval, as the search engine, the query user submitted contains only several keywords usually. This will cause unmatched issue between words of relevant documents and user's query and have more serious negative effects on the performance of information retrieval. On the basis of analyzing of process of producing query, this paper puts forward a new method of query expansion on the basis of context and global information. The approach extracts related terms between documents and query through context and global information. The expansion terms are selected according to their relation to the whole query.