In the present invention, an internal network processor, an external network processor and an embedded controller are connected separately to the main control circuit of an electronic device. The control circuit includes a BIOS, and the internal network processor, the external network processor and the embedded controller are connected to a multiplexer, so that the multiplexer can combine several input signal into a single output signal and the embedded controller can receive the control of the main control circuit. The BIOS of the electronic device, after receiving the signal from the user, can feed set signal into the embedded controller and the multiplexer for processing, and the internal and external network processor can be selected easily. |