A network device operating in a configuring mode and a normal operational mode includes: a configuration parameter memory; a network interface; a dynamic address generating unit that generates two logical addresses, when a DHCP request is received in the configuring mode, and returning one logical address to a transmission source of the request and assigning the other to the network device; a name resolving unit that transmits, when a name resolving request is received in the configuring mode, a logical address of the network device to the transmission source regardless of the name; and a parameter setting unit storing a parameter value transmitted, after the logical address of the network device is transmitted by the identifier resolving unit to the transmission source, using the logical address by said transmission source. In the normal operational mode, a network function is realized using parameters in the memory.