a database unit which stores a standard dataset labeled according to a first number of key points, an animation dataset labeled according to a second number of key points which is larger than the first number, and a photorealistic dataset having the second number of key points;

a standard learning unit which learns the standard dataset for motion estimation to generate a standard learning model;

an animation learning unit which retrains the animation dataset based on a weight of the standard learning model to generate an animation learning model; and

a motion estimation learning unit which trains the photorealistic dataset based on the weight of the animation learning model to finely tune to generate a precise motion estimation learning model.