The present invention relates to a digital instrument for use in physical therapy, including a gripping force measurement bar which measures the gripping force of a hand when the bar is grasped, a sensor portion which measures the rotation of a wrist when the wrist is turned while the gripping force measuring bar is grasped, a display device which visually displays the degree of the gripping force or the extent to which the wrist is rotated, and a memory portion which stores the degree of the gripping force of a measured value relating to the rotation of the wrist. The invention also relates to a physical therapy method using the instrument. According to the present invention, the degree of motion is assessed on a real-time basis, the degree of motion is easily controlled, and an exercise activity is rendered more interesting since the degree of the gripping force or the extent to which the wrist is rotated is measured and visually displayed.
