31. The system of claim 29 , wherein the selector further includes an analyzer configured for analyzing quality of the search results based on one or more of the query and characteristic information for the selected personalized search engine; and a scoring module configured for scoring the selected personalized search engine based on the quality of the search results.
35. The system of claim 31 , wherein the similarity computation module is further configured for determining a similarity between the query and characteristic information for each personalized search engine based on corresponding scores for each personalized search engine.