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 quantizing expressions having respective meanings and image data associated with each of the plurality of quantizing expressions; collecting a plurality of comments, input by users of the social community, about a predetermined content, the comments including a plurality of user expressions; determining, for each of the plurality of user expressions, a matching quantizing expression in the database according to the meaning of the matching quantizing expression and a meaning of the user expression; generating comment images for each of the user expressions according to the image data associated with the respective matching quantizing expression in the database; and generating summarized image data for the predetermined content by analyzing the generated comment images, wherein generating the summarized image data comprises: combining the generated comment images through at least one of a logical combination, a physical combination, and a chemical combination, and selecting, as the summarized image data, image data corresponding to a result of combining the generated comment images.