A projector displays, together with an input image, an OSD image different from the input image. The projector includes an image output unit configured to output image data of an image for the left eye and image data of an image for the right eye, an image processing unit configured to read out a different image data from a RAM, apply, to the image data of the image for the left eye, processing for arranging the different image data in a position for the left eye and combining the different image data with the image data of the image for the left eye, and apply, to the image data of the image for the right eye, processing for arranging the different image data in a position for the right eye and combining the different image data with the image data of the image for the right eye.