An apparatus and method for generating a skeleton model using motion data and image data. The apparatus for generating the skeleton model may synchronize the image data and the motion data, and generate a three-dimensional (3D) skeleton model of an entire body of a user using a silhouette extracted from the image data and also using a position or orientation of a joint of the user extracted from the motion data. The skeleton model may be generated using the image data and the motion data, thereby improving accuracy of the skeleton model of the entire body of the user.