Abstract: To enhance the targeting accuracy in providing services such as provision of samples for members by performing management of member information and authentication while securing personal anonymity. There is provided a center server and a store terminal. The center server gives a unique ID to a member application, sends it to a particular mobile information terminal and manages it as authentication information about a member who is the user of the mobile information terminal. In response to purchases of a particular article by the member, the store terminal inputs the ID from the mobile information terminal and inputs purchase information about the article the member purchases. The center server then acquires attribute information about a member identified by the ID.