Multimedia System by Using External Connection Apparatus and External Connection Apparatus Therefor

The present invention relates to a multimedia system and the external connection device using a mobile communication terminal. The invention image / audio output in a multimedia system utilizing the apparatus and a peripheral device, the image / audio output function, and peripheral devices and a control function, and output by the video / audio output device, the video and audio, peripherals, a mobile communication terminal for controlling; And moving the external connection apparatus to connect a communication terminal and a video / audio output device and the peripheral device, which relays the video and audio from the mobile terminal to the video / audio output device, and relays data transmitted and received between the mobile communication terminal and peripheral devices, using the external connection device comprising: a providing a multimedia system. According to the present invention, by using the mobile communication terminal can be connected easily with the video / audio output device or a computer mouse, joystick, and peripheral devices when playing the multimedia data, an external TV, etc., it can easily build a multimedia system . Multimedia, video, audio, remote control, output, and the mobile terminal