A server apparatus capable of preventing unauthorized use of services by a third party through an electronic appliance that stores information used for user authentication by the server apparatus. The server apparatus receives, from an information processing apparatus, pieces of user identification information, pieces of appliance identification information, and pieces of use permission/prohibition information representing on a per service type basis whether uses of services are permitted or prohibited, and stores them so as to be associated with one another. When determining based on use permission/prohibition information, which is associated with a combination of user identification information and appliance identification information that are accepted from an electronic appliance, that use of a service represented by service type information accepted from the electronic appliance is permitted, the server apparatus transmits screen information for use of the service to the electronic appliance.