11. The method of claim 1 , wherein at least one trending topic of the trending topics is a topic cluster including multiple related trending topics.
11. The method of claim 1 , wherein at least one trending topic of the trending topics is a topic cluster including multiple related trending topics. 12. The method of claim 11 , wherein the related trending topics are trending topics each of which appears in a list of last m messages from the time point for at least n times, m is a predetermined number, n is a predetermined threshold value.