To enable a user to accurately grasp a tempo of the KARAOKE music performance even when the tempo of the KARAOKE music performance is delayed according to the desire of the user.

The auxiliary tempo output system includes: input voice scoring means 27 for calculating and recording a point rating value for each tempo for each user ID based on a singing voice signal or a musical instrument performance audio signal of a user which is input following the performance of the music and a predetermined point-rating reference data; auxiliary tempo output reference setting means 28 for arranging in order of tempo a point rating value for each tempo calculated for each user ID and setting a slower tempo among the two tempos having the greatest difference between the adjacent point rating values as an auxiliary tempo output reference value for the user ID; and auxiliary tempo output means 33 for outputting the auxiliary tempo when the performance tempo changed by an instruction of an arbitrary user becomes slower than the auxiliary tempo output reference value set for the user ID of the user.