Musical score displaying data include note or musical score information indicative of a note or musical score symbol to be displayed, position information indicative of a display position on a musical score where the note or musical score symbol is to be placed, and attribute information designating any one of a plurality of musical stave rows where the note or musical score symbol is to be displayed. Note or musical score marks of a same performance part can be displayed across two musical staves, by determining any one of the plurality of musical stave rows where the note or musical score symbol is to be displayed in accordance with the attribute information. In another aspect, the musical score displaying data include at least one of first attribute information for variably controlling the display position of the note or musical score symbol in a horizontal direction and second attribute information for variably controlling the display position of the note or musical score symbol in a vertical direction. With such first and second attribute information, the display position of the note or musical score symbol can be changed to an easier-to-view position.