The current video summarization techniques are in want of a normal and expandable summarization model. To solve this problem, Entity-Description-Utility (EDU), a general expandable model, is proposed. The model starts from video entity, gets utilities after descriptions, and finally generates video summarization by the utilities. The EDU model is described in detail, and a method of news story summarization based on this model is also produced. The experiment proves the effectiveness of the method.