1. A three-dimensional (3D) shape measurement method using a stereo moiré technique, the method measuring a 3D shape of an object to be measured using a digital pattern projector and first and second cameras, the method comprising: a first step of projecting a phase-shifted fringe pattern onto the object to be measured using the digital pattern projector; a second step of acquiring four fringe images using each of the first and second cameras, and then acquiring two pieces of phase information using a moiré technique; and a third step of acquiring a pair of corresponding points, which satisfy stereo phase conditions for making all 2π ambiguity constants as integers, using the two pieces of phase information and then measuring the 3D shape of the object using the corresponding points.