An information processing system comprises a device with which network settings are associated, information processing devices connected to the device via a network, a registration unit in which identification information (specifying each information processing device storing the network settings of the device and controlling it using the network settings) is registered, a change information generating unit which generates change information (for incorporating a change in the network settings associated with the device into the network settings stored in each information processing device) upon a change in the network settings associated with the device, a first transmission unit which transmits the change information to each information processing device specified by the identification information registered in the registration unit, and an addition unit which additionally registers identification information specifying an information processing device in the registration unit upon installation of an application regarding control of the device in the information processing device.