At least one processor is configured to cause a communication unit to transmit log-in request including an account and designation of a security mode to a service server via a relay device when the security mode is set and to transmit a log-in request including an account and designation of a normal mode to the service server via the relay device when the normal mode is set. The at least one processor is configured to the communication unit to log in the service server when permission of the log-in request is received from the service server via the relay device.