3. The hot video prediction system of claim 1 , wherein the hot video predictor comprises: a network extending unit, searching, based on the user social network, for other users having common interests related to the users providing the new comment to establish the user social network corresponding to the new comment; and an inseparability measuring unit, determining the similarity among users corresponding to the new comment according to inseparability of the user social network corresponding to the new comment, and predicting whether the new video is going to be popular accordingly.
1. A hot video prediction system, comprising: a video comments database storing a plurality of video comments submitted by a plurality of users; a user social network constructor establishing a user social network of the users according to the video comments; a hot video predictor, upon receiving a new comment of a new video, determining a similar theme between the new video comment content and comment content of hot videos that have been popular for a period of time according to the user social network, and predicting whether the new video is going to be popular accordingly; a social network adaptor verifying a result of the prediction, and modifying the user social network accordingly.