Information processing system, information processing method, and computer program used therewith are provided. An information processing system includes information processing apparatuses connected to a network. The apparatuses are mutually linked to operate as a virtual information processing apparatus. The system includes a monitoring unit for monitoring the system state of the virtual information processing apparatus which includes the surplus capability of the virtual information processing apparatus and the configuration of the information processing apparatuses connected to the network, a start-condition setting unit for setting a relationship between the system state of the virtual information processing apparatus and an executable function, a function executing unit for, when the system state satisfies predetermined start conditions, executing a corresponding function, and a function-utilization-history-information storing unit for storing utilization history information obtained when the corresponding function is executed by said function executing unit.