1. A face detecting apparatus for detecting a face of a subject in an image comprising: a digital signal processor for determining if the subject is a true subject based on distance information regarding a distance to the subject and face length information, wherein the digital signal processor comprises: a focus adjusting unit for adjusting a focus of a live view image and calculating a distance between the subject and a lens; a face detection unit for detecting a face from the live view image with adjusted focus, calculating a displayed face length of the detected face, and calculating an actual face length of the detected face based on a distance between the subject and the lens, the calculated displayed face length, and a focusing distance; and a control unit for determining if the subject is a true subject by comparing the calculated actual face length of the face and a pre-stored face length reference value.