A billboard display method includes: capturing images of a scene near the screen by a number of time-of-flight (TOF) cameras, building three dimension (3D) models of the scene according to the images and the data about distances between points in the scene and the TOF cameras; checking the 3D models to determine whether there is a person nearby the screen; checking the 3D models to determine a relative position of the person to the screen upon the condition that there is a person nearby the screen; and controlling a media to be shown at a corresponding position of the screen according to the relative position of the person to the screen.