16. The method of claim 11 , wherein the method further comprises caching in a data structure a uniform resource locator for a document predefined to be relevant to at least a portion of the query.
16. The method of claim 11 , wherein the method further comprises caching in a data structure a uniform resource locator for a document predefined to be relevant to at least a portion of the query. 18. The method of claim 16 , wherein the method further comprises: determining whether the uniform resource locator for the document predefined to be relevant based on the at least a portion of the query cached in the data structure exists in the search result; extracting the uniform resource locator for the document predefined to be relevant from the search result if the uniform resource locator exists in the search result; and associating at a position of the ranking order in the search result the uniform resource locator for the document predefined to be relevant to the at least a position of the query.