Disclosed are a network access device and method for improving data transmission efficiency without replacement of a home network or additional pairing. A network access device is connected to a control server through an external wideband network and connected to at least one end point through at least one cable. Such a network access devices includes an interface module configured to couple with the network, at least one domain master connected to the at least one end point, an adaptation module configured to convert G.hn signals to Ethernet signals between the domain master and the interface module, and a processor configured to control the interface module and the at least one domain master. The processor communicates with the control server through an external wideband network to check status of the home network and provisions the home network in real time.