1. A face tracking method, comprising: detecting a face region based on an input image; segmenting the face region into a plurality of sub-regions; calculating occlusion probabilities for the plurality of sub-regions, the occlusion probabilities for the plurality of sub-regions calculated based on probability models for a plurality of parts of a template face shape, the plurality of parts of the template face shape corresponding to the plurality of sub-regions; and tracking a face included in the input image based on the occlusion probabilities.