A body-insertable apparatus system according to the present invention that takes an in-vivo image of a subject includes a body-insertable apparatus that includes: a light emitting unit that emits at least a light having a low-reflectance wavelength with a low reflectance and a light having a high-reflectance wavelength with a high reflectance to a detection-target site that has predetermined optical characteristics corresponding to a detection target and an imaging unit that receives at least the light having the low-reflectance wavelength and the light having the high-reflectance wavelength to take the in-vivo image and a detector (45) that detects the detection-target site of a detection-target area in the subject, which is a target about which whether there is the detection-target site is detected, based on an amount of the light having the high-reflectance wavelength and an amount of the light having the low-reflectance wavelength of an area of the image, the area of the image corresponding to the detection-target area.
