1. A method for recommending search phrases, comprising: obtaining one or more subject terms and one or more descriptive terms relating to the one or more subject terms from title information of information published by publishers; combining at least some of the one or more subject terms with at least some of the one or more descriptive term to form a set of one or more search phrases; calculating a first appraisal value for each search phrase, the calculating of the first appraisal value comprising multiplying term frequency of the search phrase with an inverse document frequency of the search phrase; determining a second appraisal value of each search phrase, the determining of the second appraisal value comprising: calculating an inverse class frequency of each search phrase within a designated category; and regarding the inverse class frequency as the second appraisal value; combining at least the first appraisal value and the second appraisal value of each search phrase to obtain a publisher recommendation appraisal value for each search phrase; and selecting a recommended phrase among the set of one or more search phrases based at least in part on the publisher recommendation appraisal values for the set of one or more search phrases.