PURPOSE: keyboard is provided to enable user that can be advantageously carried out piano and obtains so as to objectively evaluate user's musical repertorie and standard musical repertorie for music lesson. ;CONSTITUTION: display module (101) generates note display window, uses pre-stored standard musical repertorie information. Display module shows the finger movement presentation movement imagery or standard of the standard musical repertorie of note and the user's finger of display. The finger that finger-image processor (102) shoots user is mobile, on keyboard. Performance processor (103) shows intensity evaluation information, by comparing the strength information of the musical repertorie about performance standard and about the Performance Strength musical repertorie of user. ;The 2012 of copyright KIPO submissions
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