1. A karaoke device with built-in microphone, comprising: a body having a microphone; an A/D converting means which is provided in the body and converts inputted voices from said microphone into audio data; an audio data processing means which is provided in the body and receives the audio data from the A/D converter and processes the audio data to output processed audio data; and an audio signal outputting means which is provided in the body and outputs an audio signal on the basis of the processed audio data.