A music data display control apparatus comprising: a control section adapted to perform display control such that: a display area, in which a note is displayed on two-axis coordinates configured by a combination of a tone pitch axis and a time axis, is displayed on a display device, a display magnification ratio applied to the display area being variable; a note image of a given note is displayed in the display area at a position corresponding to a tone pitch and a tone generation time of the given note, a size of the note image being varied in accordance with the display magnification ratio; and relevant information associated with the note is displayed in association with the note image displayed in the display area, characterized in that said control section is further adapted to: determine whether the display magnification ratio is greater than a predetermined threshold value or not; and control a display style of the relevant information in such a manner that in a first display state where the display magnification ratio is greater than the predetermined threshold value, the relevant information is positioned inside the note image of the note, and that in a second display state where the display magnification ratio is equal to or less than the predetermined threshold value, the relevant information is positioned outside the note image of the note. a control section adapted to perform display control such that: a display area, in which a note is displayed on two-axis coordinates configured by a combination of a tone pitch axis and a time axis, is displayed on a display device, a display magnification ratio applied to the display area being variable; a note image of a given note is displayed in the display area at a position corresponding to a tone pitch and a tone generation time of the given note, a size of the note image being varied in accordance with the display magnification ratio; and relevant information associated with the note is displayed in association with the note image displayed in the display area, a display area, in which a note is displayed on two-axis coordinates configured by a combination of a tone pitch axis and a time axis, is displayed on a display device, a display magnification ratio applied to the display area being variable; a note image of a given note is displayed in the display area at a position corresponding to a tone pitch and a tone generation time of the given note, a size of the note image being varied in accordance with the display magnification ratio; and a note image of a given note is displayed in the display area at a position corresponding to a tone pitch and a tone generation time of the given note, a size of the note image being varied in accordance with the display magnification ratio; and relevant information associated with the note is displayed in association with the note image displayed in the display area, characterized in that said control section is further adapted to: determine whether the display magnification ratio is greater than a predetermined threshold value or not; and control a display style of the relevant information in such a manner that in a first display state where the display magnification ratio is greater than the predetermined threshold value, the relevant information is positioned inside the note image of the note, and that in a second display state where the display magnification ratio is equal to or less than the predetermined threshold value, the relevant information is positioned outside the note image of the note. determine whether the display magnification ratio is greater than a predetermined threshold value or not; and control a display style of the relevant information in such a manner that in a first display state where the display magnification ratio is greater than the predetermined threshold value, the relevant information is positioned inside the note image of the note, and that in a second display state where the display magnification ratio is equal to or less than the predetermined threshold value, the relevant information is positioned outside the note image of the note. control a display style of the relevant information in such a manner that in a first display state where the display magnification ratio is greater than the predetermined threshold value, the relevant information is positioned inside the note image of the note, and that in a second display state where the display magnification ratio is equal to or less than the predetermined threshold value, the relevant information is positioned outside the note image of the note.