In a network system (1), in response to a user's operation on a video telephone (32) having no browser function, WEB data described in HTML is supplied from a WEB server (26) to a WEB browse server (4) by HTTP. The supplied WEB data is converted by the WEB browse server (4), for example, into dynamic image data in the MPEG format which can be displayed on the video telephone (32). Furthermore, the dynamic image data is distributed via a transmission path set between the WEB browse server (4) and the video telephone (32) by line switching to the video telephone (32) so as to be displayed. That is, in the network system (1), a user of the video telephone (32) having a dynamic image display function and an audio transmission function but no browser function can view a WEB image on the Internet.