An information processing system includes a common service providing unit configured to manage a user with organization identification information, user identification information, and unique identification information, and to provide a common service; and an application service providing unit configured to manage a user with user identification information, and to provide an application service by using the common service. The application service providing unit includes a receiving unit configured to request the common service providing unit to perform authentication on user identification information and organization identification information received from an external device, and receive, from the common service providing unit, the unique identification information associated with the user identification information and the organization identification information received from the external device, and a requesting unit configured to identify a user with the unique identification information and request the common service providing unit to provide the common service.