1. A diagnosis assisting apparatus comprising: a display; an imaging unit configured to image a subject using a camera; a line of sight detecting unit configured to detect, by calculation by a controller, a line of sight direction of the subject from a picked-up image imaged by the imaging unit; a point of view detecting unit configured to detect, by calculation by the controller, a point of view of the subject in a display region of the display based on the line of sight direction; and an output controller configured to output by the controller and display a diagnostic image including a natural image and a geometrical image, wherein the point of view detecting unit detects the point of view of the subject in a case where the diagnostic image is displayed, the natural image includes an image of a face, and the geometrical image is a circle having a difference between a width or length of the face and a radius is equal to or less than a first threshold, or an ellipse having a difference between the width of the face and a length of a minor axis is equal to or less than a second threshold, or an ellipse having a difference between the length of the face and a length of a major axis is equal to or less than a third threshold.