17. The computing device as recited in claim 16 , wherein the finding the one or more core words among the one or more words from the query comprises: determining a word in the one or more words after the segment as a present word; and if a difference between a category click rate of a string formed by the one or more words after the segment except for the present word and a category click rate of another string formed by the one or more words after the segment reaches a second threshold, determining the word as a core word; or if a difference between a category click rate of a string formed by the one or more words after the segment except for the present word and a category click rate of another string formed by the one or more words after the segment does not reach the second threshold, determining the word as a non-core word.
16. A computing device comprising: one or more processors; and computer storage media having stored thereon computer-executable components that are executable by the one or more processors to perform actions including: obtaining a category click rate of a query and a category click rate of published information, the category click rate being a percentage of a number of clicks of a respective category to a number of all categories to which the query belongs, calculating a similarity degree between the query and the published information based on the category click rate of the query and the category click rate of the published information, and returning the published information as a successful matching result if the calculated similarity degree is higher than a first threshold, wherein the obtaining the category click rate of the query includes: segmenting the query to obtain one or more words, finding one or more core words among the one or more words from the query, and obtaining a category click rate of a string formed by the one or more core words for the corresponding category as the category click rate of the query.