A system member of a data processing system 1 operates a terminal 3 to connect a server 5, and further to a site for creating a new group from a main site. A group name is registered, and a group ID and group password are then attained. Based on articles written on a point system registration card obtained in a shop, the member connects the terminal 3 to a registration site server 6 and inputs requirements, to register a point card. When registering points, an icon of "side trip" is operated so that shop data is transferred to the server 5, to input the shop data as data to be opened within the group. The shop data can be subjected to data processing such that the shop data can be disclosed as a favorite shop like a hiding place within a group.