To explicitly identify network devices without providing a database server using an IPv6 address. An IPv6 address for address management on a network is set in a network device connected to an IPv6 network and the network device keeps and maintains the address. An interface ID 12 of the IPv6 address is composed of a maker ID 13, a management ID 14, a device ID 15, and a function ID 16. Maker information kept and maintained by a maker of the network device is assigned to the maker ID 13 and a number indicating management by a device type is assigned as a number indicating a management system type to a device the management ID 14. The device ID 15 has numbers indicating a device type 17, a product type 18, and a product serial number 19. A number indicating a function of the network device is assigned to the function ID 16. 展开▼
