The apparatus and method displays sheet music for an electronic keyboard instrument on a monitor. The apparatus includes a sound length detector (7) for detecting length of interval through which a keyboard is pressed, a sound length compensator (8) for converting the detected sound length to standard sound length, a notation signal generator (9) for gnerating notation signal according to the decided standard sound length, a measure detector (11) for detecting snatches, a measure counter (12) for counting the number of snatch, a mode switch (15) for setting modes, a mode controller (16) for controlling sheet music according to modes selected by a user using the mode switch, a repeat signal generator (13) for generating repeat sign when repeated tune is played, and a display controller (17) for displaying notations on a display.
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