[Problem] For example, to increase the operating efficiency of an operation that uses the transparent object of a transparent treatment tool or the like. [Solution] When captured images are obtained by capturing images of an object that is transparent with regard to light in a first wavelength band and opaque with regard to light in a second wavelength band, and when the captured image obtained by selectively receiving the light in the first wavelength band is made to be a first captured image and the captured image obtained by selectively receiving the light in the second wavelength band is made to be a second captured image, an image region in which the object exists is detected as an object region on the basis of the second captured image. Then, the outline of the object is superimposed on the first captured image on the basis of information regarding the detected object region.