Patent ID: 7644154

Claim:
An address information display system which is configured so that at least a first node included in a plurality of nodes forming a network will function as an address information display apparatus capable of displaying address information for an address assigned to a device connected to the network, comprising: an address information storage unit configured to store address information for the device, while storing a plurality of address information items corresponding to each of a plurality of addresses assigned to the device; a judgment unit configured to judge whether an address assigned to the device is in a usable state based on the address information stored in the address information storage unit while judging whether each of a plurality of other addresses of the same device is in the usable state based on one or more corresponding address information items; and a display unit configured to display at least one address of the device judged by the judgment unit to be in the usable state when such an address exists while performing one of: displaying each address of the device judged by the judgment unit to be in an unusable state in a display style different from a display style of the address judged to be in the usable state, and not displaying each address judged to be in the unusable state.