To provide a device monitoring system, device monitoring program, and device monitoring method which can monitor device status quickly without increasing the load on device management servers or increasing network traffic.
Devices 10 connected to a network N are provided with a device monitoring function 20 for monitoring another device 10 and notifying a device management server 12 or a third device 10 of any abnormality. This eliminates the need for periodic interrogations of devices 10 by the device management server 12 and responses from the devices 10 unlike conventional schemes, and thus avoids increases in the load on the device management server 12 and in network traffic even if the number of devices 10 increases.