1. An image processing apparatus comprising: an area dividing unit that divides an image obtained by capturing inside of a body lumen into one or more areas by using a value of a specific wavelength component that is specified in accordance with a degree of absorption or scattering in vivo from a plurality of wavelength components included in the image or wavelength components obtained by conversion of the plurality of wavelength components; and a target-of-interest site specifying unit that specifies a target-of-interest site in the area by using a discriminant criterion in accordance with an area obtained by the division by the area dividing unit.