In a system for providing a service to members of a group, a more complex form of the group can be flexibly and appropriately dealt with, and the service that is more convenient for the group can be provided. A group management database stores a group property, thereby a quantity of prints printed by a laboratory and information provided by a terminal can be determined based on the group property and the number of the members, for example. Furthermore, the group can be changed. In addition, security of image search can be set for the group by using the terminal. One of the members in charge of payment is registered for the group so that the member can collectively pay for the group.