Abstract: A system including a first server that provides a first service is provided and includes communication and control circuitry. The communication circuitry communicates with a terminal of a user having a first account of the first service and with a second server that provides a second service. The control circuitry sends a request screen to the terminal when a request for a commodity or service has been received from the terminal in a non-logged-in state with the first account, inquires of the second server or a server associated with the second server whether the user has a second account associated with identification information of the user when the identification information is entered on the request screen, and sends, to the terminal, display information for logging in with the first account and performing linking processing of the first account and the second account when the user has the associated account.

Abstract: An information processing system includes a first service server that provides a first service. The system includes a communication circuitry and a control circuitry. The communication circuitry communicates with a user terminal of a user not having a first account of the first service and with a second service server that provides a second service different from the first service. The control circuitry sends a purchase request screen to the user terminal when a purchase request for a commodity or service has been received from the user terminal, inquires of the second service server whether or not the user has a second account associated with predetermined identification information of the user when the identification information is entered on the purchase request screen, and sends display information for registering the first account and performing linking processing of the first account and the second account when the user has the associated account.