1. A face detecting method, comprising the steps of: receiving light incident from a human subject for each color component, to obtain a plurality of pieces of pixel data; generating a raw image of the human subject employing the obtained plurality of pieces of pixel data; generating a green signal image employing green pixel data, which are among the plurality of pieces of pixel data, obtained by receiving green components of light from the human subject; and detecting a facial image within the raw image by detecting the facial image within the green signal image.