A child’s play ramp, of flexible sheet material, leading up to a play room. Also, by performing translucent display of the OSD data and natural-image data, an area which is not to be highlighted can be set. A unit transmits position and orientation information of the camera to an apparatus. When detecting an abnormality in a negative intake pressure sensor or an EGR control valve based on the negative intake pressure of the engine, the engine is prohibited from running in a cylinder cut-off state even during deceleration, thus generating a negative intake pressure and thereby enabling the abnormality detection to be carried out without any problems.