A position information generating unit of a personal computer generates position information using GPS and/or PHS, and outputs the generated information to a supplementary information generating unit. The generating unit supplements the position information from the position information generating unit with additional information such as map data, and outputs the supplemented information to an HTML generating unit. The HTML generating unit generates an HTML file out of the supplemented position information from the supplementary information generating unit, and transmits the generated file to a content server. A position information transmission-reception control unit of the content server stores the HTML-format position information thus sent from the personal computer into a storage unit. An HTML acquiring unit of the personal computer acquires position information in HTML format about another member from the storage of the position information transmission-reception control unit, and causes the obtained information to appear on a display unit.