A system including a site specifying portion for receiving an identifier of a base site that becomes the basis of a displayed presentation and receives an identifier of a compared site displayed in a language different from that of the base site, a base page specifying portion that specifies a base page from the base site, a language converting portion that consolidates words of different languages into a single language, an aggregated word information producing portion that produces information for comparing the base page, a related page specifying portion that specifies a related page similar to the base page from among each compared page based on the word information of the base page and the word information of each compared page, and a display controlling portion that presents the related page together with the base page on the same display screen.