A second management server includes: a reception unit configured to receive a request of notification information, which includes identification information identifying the communication apparatus, from the first management server; a generation unit configured to generate a URL for service registration, which includes the identification information, in a case where the request is received; a transmission unit configured to transmit reply information, which includes the generated URL, to the first management server as a response to the request; and a second transmission unit configured to transmit a request of registration with the service, which is based on the identification information, to the service provider server in response to an access to the URL.