A service usage management method executed by an information processing system including a first information processing device and a second information processing device (300, 200, 100), the service usage management method comprising: transmitting, by a terminal device (31...34) used by a user, to the first information processing device, a first request which requests the user's right to use a first service provided by the first information processing device, transmitting, by the first information processing device, to the terminal device, first authentication information which authenticates the user's right to use the first service, wherein the first authentication information includes an identifier of the first information processing device, and further includes a number of times that issuing processing for issuing authentication information has been performed, transmitting, by the terminal device, to the second information processing device, the first authentication information and a second request which requests the user's right to use a second service provided by the second information processing device, receiving, by the second information processing device (300, 200, 100), from the terminal device (31...34) used by the user, the first authentication information and the second request which includes a number of times that issuing processing for issuing authentication information has been performed and the identifier of the first information processing device (400, 300, 200, 100) as the issuing source of the first authentication information, generating, by the second information processing device, based on the first authentication information, second authentication information which includes the number of times, wherein one has been added to the number of times indicated in the received first authentication information, and the identifier of the second information processing device (300, 200, 100) and which authenticates the user's right to use the second service (C, B, A) provided by the second information processing device, and transmitting, by the second information processing device, the generated second authentication information to the terminal device (31...34). transmitting, by a terminal device (31...34) used by a user, to the first information processing device, a first request which requests the user's right to use a first service provided by the first information processing device, transmitting, by the first information processing device, to the terminal device, first authentication information which authenticates the user's right to use the first service, wherein the first authentication information includes an identifier of the first information processing device, and further includes a number of times that issuing processing for issuing authentication information has been performed, transmitting, by the terminal device, to the second information processing device, the first authentication information and a second request which requests the user's right to use a second service provided by the second information processing device, receiving, by the second information processing device (300, 200, 100), from the terminal device (31...34) used by the user, the first authentication information and the second request which includes a number of times that issuing processing for issuing authentication information has been performed and the identifier of the first information processing device (400, 300, 200, 100) as the issuing source of the first authentication information, generating, by the second information processing device, based on the first authentication information, second authentication information which includes the number of times, wherein one has been added to the number of times indicated in the received first authentication information, and the identifier of the second information processing device (300, 200, 100) and which authenticates the user's right to use the second service (C, B, A) provided by the second information processing device, and transmitting, by the second information processing device, the generated second authentication information to the terminal device (31...34).