A system for and a method of measuring motions of a thumb and fingers of a user who wears a glove are provided. The method includes attaching first ends of first and second flexible wires to positions of the glove respectively corresponding to middle and proximal phalanxes of each finger, and connecting second ends of the first and second flexible wires to a sensing module so that the first and second flexible wires can move forward and backward while maintaining tension thereof in accordance with a motion of the finger. The method further includes, by the sensing module, measuring moved distances of the first and second flexible wires, such that rotary angles at corresponding joints in the thumb and fingers are calculated based on the measured moved distances.