1. An automatic vision display apparatus comprising: a flight object having a floating gas filled therein to fly, flying along a vertical wall surface and including a screen mounted at an opposite side to the vertical wall surface; a propulsion unit mounted at a predetermined position of the flight object and moving the flight object; a control unit mounted to the flight object and controlling the propulsion unit; a projector projecting an image on the screen of the flight object at a distance from the flight object; an adjusting unit adjusting an image projecting direction of the projector, and a main control unit controlling the projector to project the image and controlling the adjusting unit so that the projector tracks a movement of the flight object to project an image.