A projector is provided which divides and projects a single image onto two different projection surfaces and appropriately performs virtual user interface through one projection surface. The projector (100) projects a VUI screen image (22) on a desk (20) and projects a main projected screen image (32) on a wall (30). The projector (100) includes a light-receiving element (170). The light-receiving element (170) is installed at a position that receives light emitted to the desk (20) (the projection surface of the VUI screen image (22)) and reflected (or scattered) by an object (10) in the vicinity of the desk (20). The projector (100) calculates a position of the object (10) based on a light detection timing of the light-receiving element (170) and a scanning position of light at each time. The projector (100) changes a projected image based on the calculated position. The projector (100) displays a designated region of the VUI screen image (22) (for example, a region including the position of the object or an icon display region or a region surrounding an icon) to be brightened.