1. A method, comprising: determining one or more categories that correspond to a plurality of queries; sorting the plurality of queries into one or more groups based at least in part on the determined categories of the plurality of queries; segmenting queries that correspond to each of the one or more groups into a first plurality of phrases, wherein each phrase includes one or more words; determining occurrence probabilities for the first plurality of phrases; and determining word information entropies for the first plurality of phrases based at least in part on the determined occurrence probabilities.