Abstract: A portable karaoke device comprising an MP3 decoder for downloading an accompaniment of a desired tune, and an expandable sound module for storing the accompaniment downloaded by the MP3 decoder. A video signal is received from a video unit by radio and then utilized as a background picture. A video signal mixed with a lyrics caption is transmitted by radio to the video unit so that the user can view the background picture and lyrics. In addition to a main microphone over which the user sings while listening to an accompaniment sound, there is provided an auxiliary microphone for transmitting a signal by radio. The user can select and apply a next tune using the auxiliary microphone while singing over it. Therefore, with no necessity for replacing a sound module in which lyrics and accompaniments of newest songs are previously recorded and a video unit that provides a background picture, the user can simply and efficiently use the present device.