A medical apparatus system includes: an image generating section that generates an image in an observation field of view obtained from an observing section including an objective lens an information collecting section that collects information of a treatment instrument a distortion setting section that sets virtual distortion on the outside of the observation field of view from a characteristic of distortion of the objective lens a distorted image generating section that generates a distorted image on the outside of the observation field of view with respect to the treatment instrument and an image combining section that generates a combined image such that an image of the treatment instrument on the inside of the observation field of view and a distorted image of the treatment instrument coincide with each other in a boundary of the observation field of view.
