A performance information display apparatus which makes it possible to easily check whether or not automatic performance based on performance data is carried out in accordance with the creator's intention. Performance data includes sounding designation data which designates sounding starting timing and sounding ending timing of each of musical tones constituting a musical composition, and is stored in a performance data storage section 302. A generation time period calculating section 308 calculates a generation time period of a musical tone signal indicative of each of the musical tones corresponding to the sounding designation data in the performance data to be generated by a musical tone generating device when the musical tone generating device is instructed to generate the musical tone signal. A display processing section 304 instructs the display section 305 to display the sounding starting timing and the sounding ending timing designated by the sounding designation data corresponding to at least one of the musical tones constituting the musical composition, and instructs the display section 305 to display at least an end of a generation time period of the musical tone signal indicative of the at least one musical tone calculated by the generation time period calculating section 308.