A technology for enabling an observer to appropriately control an operation panel in accordance with a condition is provided. When an instruction for changing the position of the operation panel is input, the operation panel is disposed at the position of a pen input device. When an instruction for terminating the changing of the position of the operation panel is input, the position and orientation of the operation panel are fixed. An image of virtual objects including the operation panel viewed from a camera is generated, the generated image is superimposed on an image in a real space captured by the camera, and an image obtained by the superimposition is output to a display unit.