To provide a device and a method connected to a communication line and providing network connection of data processing terminals.

The device connected to the communication line and providing the network connection of the data processing terminals is provided with an Ethernet (R) interface providing the connection with a first data processing terminal, a USB interface providing the connection with a second data processing terminal, a line interface providing the connection with the communication line and a control part determining the interface corresponding to the destination of a received packet by referring to a destination address of the packet received from one of the respective interfaces and transmitting the received packet to at least one of the respective interfaces.