1. An object determining device comprising: a face detecting part for detecting, from an image imaged based on arbitrary focal point information as an image to be processed, a face of a person based on a relative value of statistics in a plurality of characteristic regions produced by contour or parts of a face of a person from the image to be processed; and a determining part for determining a subject to be focused and/or subject on which to perform exposure control when performing imaging based on the face detected by the face detecting part.