An information processing system includes a client apparatus and a service providing system. The client apparatus includes first circuitry to transmit, to the service providing system, a package acquisition request for obtaining a package including at least one application program. The service providing system includes second circuitry. The second circuitry receives the package acquisition request, and obtains the package. The second circuitry receives, from the client apparatus, an email address and a tenant setup request, and generates a usage registration screen. The second circuitry transmits an email addressed to the email address, the email including a network, and receives an access to the usage registration screen from an information processing apparatus. The second circuitry sets up a tenant in response to acquisition of package identification information, and registers the at least one application program included in the package identified by the package identification information with the tenant.