2. The method of claim 1 , further comprising: storing click rate information for each of search queries in a computer-readable memory; and wherein said relation between said first search query and said second search query is determined based, at least in part, upon said calculated conditional probability, said calculated correlation, and stored click rate information of said second search query.
2. The method of claim 1 , further comprising: storing click rate information for each of search queries in a computer-readable memory; and wherein said relation between said first search query and said second search query is determined based, at least in part, upon said calculated conditional probability, said calculated correlation, and stored click rate information of said second search query. 3. The method of claim 2 , wherein said click rate information is generated in accordance with a ratio of a number of clicks on a search result to a number of searches of each of the search queries.