Most Internet users use search engines to get information on the WWW. However, users cannot be content with the output of search engines because it's hard to express the user's own interest as a search query. Therefore, we propose a system which provides users with keywords related to user interest. Users can recall keywords expressing user's hidden (not described in a search query) interest as search keywords. The system includes an interface to restructure a part of the user's search query. Users can compose a new search query expressing concrete user interest with the interface. Previous refinements are simple modifications of the search queries, for example, adding narrow keywords or relational keywords. However, the restructuring described in the paper includes replacement of the search keywords.
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