Disclosed is an Ethernet-IEEE 1394 repeater apparatus as a network transmission equipment for connecting between networks having the same or different protocols is disclosed. The apparatus includes a first protocol physical element for performing a modulation/demodulation process of a first protocol data; a second protocol physical element for performing a modulation/demodulation process of a second protocol data; an output interface for outputting the data through an output transmission, media; a first switch for switching the data input to one of the first protocol physical element and the second protocol physical element; a second switch, tuned with the first switch, for switching an output path to one of the first protocol physical element and the second protocol physical element, the output path being connected to the output interface; and a control unit for receiving a protocol information of data sent from one of the first protocol physical element and the second protocol physical element to control the first switch and the second switch based on the received protocol information, the one being selectively connected based on the current switching condition.