1. A method for determining a frontal face pose, the method comprising: detecting a face region in an image; detecting an eye region after adjusting position of the eye region according to a rotation direction of a roll angle detected by analyzing an edge direction around an eye in the detected face region; normalizing the face region; analyzing a symmetry in the normalized face region by setting a final reference symmetry axis by extracting a final symmetry score in which bisymmetry is corrected in an image I M extracted from the normalized face region; and determining whether a face pose is a frontal face pose based on the analysis of symmetry.