The invention relates to a tone information processing apparatus and method. If a pitch bend event is included in a note event, one tone to be sounded in accordance with the note event continuously varies in pitch from a note pitch designated by the note event to another note pitch, as a result of control response to the pitch bend event. For sounding of a note based on an accompaniment pattern, harmony note or the like, the pitch corresponding to the note event is converted in accordance with a designated chord, and thus, not only the note pitch corresponding to the note event but also the other note pitch responsive to the pitch bend event should be converted appropriately. Thus, arrangements are made for accurately determining the pitch-bend-responsive other note pitch that is not identifiable from the note pitch indicated by the note event itself and converting the other note pitch in accordance with a designated chord. Also, where waveform data of a tone comprises bend waveform data continuously varying in pitch, individual note pitches included in the bend waveform data can be converted appropriately in a manner similar to the above.