A method and apparatus for attaching a display device to an exterior member in an electronic device are provided. The method includes arranging a tube to be at least partially surrounded by a foldable flexible display device, arranging the flexible display device to be at least partially surrounded by the exterior member, the flexible display device and the exterior member being folded, and inflating the tube by injecting gas into the tube. The flexible display device is attached to inner surfaces of the exterior member by the inflation of the tube.