An information processing system includes a plurality of information processing apparatuses, each apparatus including a transmission unit and a verification unit, and a plurality of authentication servers connectable to the plurality of information processing apparatuses via one or more networks. When one information processing apparatus, used as a receiving apparatus, receives a request of executing a processing at the receiving apparatus from other information processing apparatus, used as a requesting apparatus, the transmission unit of requesting apparatus transmits information to the receiving apparatus, and the verification unit of receiving apparatus determines whether the requested processing can be executed at the receiving apparatus for a user of the receiving apparatus based on a comparison of the information transmitted from the requesting apparatus and information settable for the receiving apparatus by using the authentication server useable for user verification of the information processing apparatuses.