For a plurality of types of additional attribute data included in note data, a selection section selects one or more of the plurality of types of additional attribute data. For a plurality of the note data, a display section displays pictorial figures or the like representative of the contents of the additional attribute data of the types selected by the selection section, in proximity to pictorial figures or the like representative of pitches and sounding periods of the note data. The display section also displays pictorial figures or the like indicative of the contents of the additional attribute data, at positions and in sizes corresponding to periods or timing when musical expressions or the like indicated by the additional attribute data are to be applied.