An information processing system includes an object information acquiring unit, a receiver information acquiring unit, and an authentication information issuing unit. The object information acquiring unit acquires delivery object information of an object from a deliverer of the object. The object is stored in an interior space of a vehicle and of which delivery is desired. The receiver information acquiring unit acquires receiver information on a receiver of the object. The authentication information issuing unit issues authentication information for locking and unlocking a door of the vehicle based on the delivery object information and the receiver information and transmits the authentication information to a terminal of the receiver.