Interface apparatus connecting between multimedia network and music network

An interface apparatus connects between a first node involved in a multimedia network which generally treats multimedia information including music information transferred in a generalized protocol, and a second node involved in an musical network which specially treats music information transferred in a specialized protocol. The interface apparatus has an input device that operates when the second node communicates with the first node for converting the music information from the specialized protocol into the generalized protocol so that the first node can admit the music information from the second node, and an output device that operates when the first node communicates with the second node for converting the music information from the generalized protocol into the specialized protocol so that the second node can admit the music information from the first node. Typically, the input device and the output device are integrated in the first node.