15. The apparatus according to claim 13 , wherein the sample video library comprises at least two videos, and the sample video library comprises videos in at least two categories, wherein the second generation unit comprises: a set subunit, configured to obtain a screening result set according to screening results of the motion phrases corresponding to the videos in different categories in the sample video library; and a second generation subunit, configured to generate, according to the screening result set, the descriptive vector corresponding to the videos in the sample video library.
16. The apparatus according to claim 15 , wherein the classification module comprises: a third generation unit, configured to generate a response vector corresponding to the to-be-detected video; a third acquiring unit, configured to acquire the descriptive vector corresponding to a video in each different category in the sample video library, and obtain a first classification rule according to the descriptive vector, wherein the first classification rule is used to determine the category to which the to-be-detected video belongs; and a first classification unit, configured to determine, according to the first classification rule and the response vector, that the category of the to-be-detected video is the same as a category of the categories of the videos comprised in the sample video library, and classify the to-be-detected video.