Disclosed is a method for displaying an advertisement. The method displays a present advertisement, determines whether the present advertisement has been displayed completely, and adds an identifier of the present advertisement to a priority advertisement list if the present advertisement has not been displayed completely. The method sends the priority advertisement list to the advertisement engine when requesting the advertisement engine for displaying a next advertisement. Using the priority advertisement list, the advertisement engine may give priority to the present advertisement in next advertisement assignment. Using an optimized advertisement display strategy, the disclosed method may increase coverage rates of advertisement contents to audiences, thereby improving advertisement effectiveness for advertisers and increasing cash flow return for website owners.