2. The page re-ranking system described in claim 1 , wherein the covering degree of the topic representation contained in the super page of one of the multiple Web pages is a similarity degree or a difference degree concerning the topic representation between the super pages of the multiple Web pages.
2. The page re-ranking system described in claim 1 , wherein the covering degree of the topic representation contained in the super page of one of the multiple Web pages is a similarity degree or a difference degree concerning the topic representation between the super pages of the multiple Web pages. 4. The page re-ranking system of claim 2 wherein the similarity degree between the super pages is calculated using a historical similarity of a first Web page, and a cosine similarity of a vector of a super page of the first Web page and a vector of a super page of a second Web page.