1. An operating method of a virtual ontological system for a social community, the operating method comprising: storing and maintaining, in a database, a plurality of expressions and image data associated with each of the plurality of expressions; collecting comments, input by users of the social community, about a predetermined content; generating comment images matching each of the comments based on image data associated with an expression included in the collected comments; and generating summarized image data for the predetermined content by analyzing the generated comment images.