In an information processing system comprising a redundantly furnished plurality of second information processing apparatuses being commonly connected with a first information processing apparatus through an information transmission path to supervise the first information processing apparatus, and a third information processing apparatus being connected with the second information processing apparatus through an information network to manage the second information processing apparatus, wherein each of the second information processing apparatuses comprises a connection confirmation control logic for trying to transmit connection confirmation information to the third information processing apparatus through the information network in compliance with an instruction being given by the one representative second information processing apparatus, and the third information processing apparatus comprises a maintenance management control logic for collecting the connection confirmation information arriving from each of the second information processing apparatuses and transmitting collected results by e-mail to a manager of the first information processing apparatus.