Abstract: A karaoke system acoustically outputting karaoke musical accompaniment together with a singing voice input from a microphone, and in the conjunction therewith, performing video output for image of lyric in synchronism with progress of karaoke musical accompaniment, is capable of announcing calorie consumption achieved by singing a song. The karaoke system includes sound volume integrating part for sampling singing voice input volume from the microphone at a given interval and sequentially integrating respective sampled values, converting part for converting an integrated value derived by the sound volume integrating means into a calorie consuming amount of a physical exercise by singing a song according to a predetermined algorithm, and announcing part for announcing the calorie consuming amount derived by the converting means to a user.