Provided is an image-display apparatus on which an object to be observed can be applied, the image-display apparatus comprising: a display screen； a plurality of light-emitting units arranged to emit light out of the screen from behind the screen； a plurality of light sensors arranged behind the screen to detect light including light emitted from at least one light-emitting unit and reflected from an object applied to the display screen, and to output at least first and second detection values； and determination means for determining, based on the detection values output by the plurality of sensors, a first region of the display screen corresponding to a region to which the object is applied to the display screen.
