An information processing system provides a web service to an information processing device having personal information from a server device providing the web service. The server device includes: an issuing unit that issues an access token in response to a request from the information processing device; an authentication unit that receives a service provision request from the information processing device and authenticates the access token; and a transmission unit that transmits a command for using the personal information to the information processing device when the access token is authenticated. The information processing device includes: a registration requesting unit that requests the server device to register the information processing device; a provision requesting unit that transmits the service provision request to the server device using the issued access token; and a utilization unit that uses the personal information in accordance with the command.