1. A system for motion control of a robot, comprising: a remote controller for recognizing three-dimensional image information, which includes two-dimensional information and distance information of a user, determining a first reference point and a second reference point from the three-dimensional image information, calculating a variation in an angle of a joint in accordance with three-dimensional coordinates of the first reference point and the second reference point, and transmitting a joint control signal corresponding to the variation in the angle of the joint through a wired/wireless network; and a robot for checking joint control data from the joint control signal received from the remote controller, transmitting motor control signals to respective drive motors by comparing the joint control data with previous angles of joints and dividing the joint control data into time-based data through interpolation, and varying the angle of the joint to move according to the user's motion.