A server system transmits, to a terminal apparatus, list information of a service list, communication information corresponding to a service in the list and used to communicate with a service providing server system, and authentication information corresponding to an apparatus. The terminal apparatus selects service(s) from the list, and transmits, based on the communication information corresponding to the selected service(s), the authentication information to service providing server system(s) corresponding to the selected service(s). The server system executes a registration process for enabling the apparatus to use the service corresponding to each of the service providing server system(s), if the authentication information is received from each of the service providing server system(s).