A network relay apparatus and method are provided. The network relay includes a sub-network interface for communication with a sub-network, a plurality of backbone network interfaces for communication with a plurality of backbone networks, and a control unit for outputting data, which is received from a device included in the sub-network through the sub-network interface, through one of the backbone network interfaces. In the network relay, it is possible to fulfill various requests for communication quality by connecting the sub-network with the plurality of backbone networks.