An imaging apparatus, an imaging method, an imaging system and attachment means

The present invention relates to an imaging apparatus, an imaging method, a program, and attachment means of the imaging system. Said image forming apparatus comprising: an illumination unit that can be switched to the illumination direction of the body; and a control unit for performing focusing each of the illumination direction of the body in accordance with focus adjustment state evaluation value is calculated, based on the evaluation value which a focus state becomes the best as a lighting direction to determine the direction of the photographing subject.