1. A method for mobile search, comprising: receiving a search request, wherein the search request carries keyword information to be searched for, and an instant interest model and a long-term interest model acquired by a search application server; calculating a relevance score value of each member engine according to the search request, meta index information of the member engine, the instant interest model, and the long-term interest model; and selecting one or more member engines according to the relevance score value to search for the keyword information.