An automatic performance apparatus reproduces, by a program process executed on a computer, automatic performance data comprising a series of performance data which is assigned to one channel of a plurality of channels and to which a channel number representative of the assigned channel is added. The automatic performance data contains identification data representative of a musical instrument or performance part to be performed by the performance data which is assigned to each channel. To the identification data, a channel number representative of the assigned channel is also added. Based on the identification data, musical instruments or performance parts to be performed by each of the performance data are identified. As a result, the present invention configured as above provides users with easy specification of musical instrument or performance part to be excluded from a performance or to be performed during the reproduction of performance data, enabling the reproduction and non-reproduction of each performance part to be precisely controlled.