1. A subject tracking apparatus, comprising: a storage section that stores image data of a subject; a division section that divides the image data of the subject into a plurality of first areas; an imaging section that sequentially generates image frames; a specification section that specifies a second area similar to one of the first areas, the second area being included in each of the image frames sequentially generated by the imaging section, based on a characteristic value of one of the first areas into which the image data of the subject is divided by the division section; and a tracking section that tracks an image area as the subject in each of the image frames sequentially generated, wherein the image area is determined based on the second area specified by the specification section.