11. The method according to claim 9 , wherein generating the query result list further comprises: classifying the determined relationships between the requested query and each of the one or more candidate queries as a parent relationship, a child relationship, or a sibling relationship; and arranging the requested query and the one or more candidate queries in a hierarchical structure based on the classifications of the determined relationships.
9. A method of generating a query result list in response to a query request, the method comprising: processing a log of queries; constructing a query hierarchy for the query request from the log of queries by generating a candidate query list of one or more candidate queries, wherein the one or more candidate queries in the candidate query list are determined based upon a relative coverage determined between the query request and each candidate query, the relative coverage between the query request and a candidate query representing a similarity between the content of pages clicked by a user in response to the candidate query and the content of pages clicked by a user in response to the query request determined from information obtained by mining click-through data, and determining relationships between the requested query and each of the one or more candidate queries in the candidate query list; and generating a query result list based on the query hierarchy.