INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING METHOD, AND INFORMATION PROCESSING APPARATUS

An information processing system includes one or more information processing apparatuses that implement an output data reception unit that receives sets of output data via a network, an identification unit that identifies a user identifier to be associated with the received sets of output data by referring to user information stored in a user information storage unit, a storage processing unit that stores the sets of output data in a data storage unit in association with individual identifiers and a common identifier when the user identifier is not identified by the identification unit, a reporting unit that reports the common identifier via the network, and a transmission unit that receives the user identifier or a combination of an individual identifier and the common identifier via the network, and sends output data associated with the received user identifier or the received combination via the network.