The practical realization and popularization of myoelectric hands are expected for the daily life support of upper-extremity amputees. The high-precision recognition of electromyogram (EMG) pattern and advanced hand motion control are essential for the realization of myoelectric hands. On the other hand, the user’s proficiency improvement through the EMG operation training is also required. This study describes a visual feedback type operation training system with the reference value revision. This revision yields a significant effect on the prevention of the false recognition. Some experiments are provided to verify the effectiveness of the proposed operation training system.