PURPOSE: A network linking system and a method thereof are provided to perform address conversion in consideration of IP(Internet Protocol) and WPAN(Wireless Personal Area Network) network features. CONSTITUTION: A network terminal(200) is located in a WPAN. The network terminal exchanges a packet with an internet server through a network relay device(300). The network relay device forms a WPAN about one or more network terminals. The network relay device performs address conversion according to a network feature. The network relay device relays packet exchange between an IP network and a WPAN.
