A display apparatus (100) and method for calibrating a touch system are provided, the display apparatus including: a display panel (110) which displays an image; an image processor (120) which processes an image displayed on the display panel; a light source unit (130) provided on the display panel and which emits light; a camera unit (140) which photographs an image to detect a touch position by a user on the display panel and a calibration image of light emitted by the light source unit; and a controller (180) which controls the image processor to process an image on the basis of the touch position by the user on the image taken by the camera unit and calibrating the touch position by the user on the basis of a position of the light on the calibration image taken by the camera unit.