1. A projector comprising: a projection section adapted to project an image on a projection surface; a focus adjustment section adapted to perform a focus adjustment of the projection section in accordance with an operation; a shooting section adapted to shoot the projection surface; an evaluation value calculation section adapted to calculate an evaluation value used to evaluate contrast of a shot image of the shooting section; and a control section adapted to make the projection section project an image, which is a graphical representation illustrating a difference between the evaluation value calculated by the evaluation value calculation section after the focus adjustment and a maximum value of the evaluation values having been calculated by the evaluation value calculation section before the focus adjustment, on the projection surface in a case in which the focus adjustment section has performed the focus adjustment in accordance with the operation, wherein the graphical representation includes a set of stages of images which are simultaneously displayed so as to illustrate the sharpness of the focus as the focus adjustment is performed, wherein each of the stages of images includes two circles, wherein the distance between the two circles represents the sharpness of the image.