This invention solves the problem of RSS, i.e., the possibility of notification failure while taking its advantage that allows use of existing software such as a browser. For this purpose, an RSS control unit detects failure occurrence via an internal interface, gives a level corresponding to the type...http://www.google.com/patents/US20090070494?utm_source=gb-gplus-sharePatent US20090070494 - NETWORK DEVICE, NETWORK DEVICE MANAGEMENT METHOD, NETWORK DEVICE MANAGEMENT SYSTEM
