A rear entertainment system has a voice synthesis circuit, an OSD unit, a video camera, a DVD playback unit, a rear monitor, a navigation unit, a mixer, an IR circuit, and headphones. The voice synthesis circuit and the OSD unit receive driving information from a handle, a brake, a winker, and so on. The voice synthesis circuit presents the driving condition in an audio form, while the OSD unit presents the driving condition in a video form. The video camera takes a scene in a forward direction. The navigation unit supports the driving of the vehicle. The mixer synthesizes the voice output of the voice synthesis circuit, audio signals from the DVD playback unit and audio signals from the navigation unit. The IR circuit converts the synthesized audio signals into IR signals. The headphones receive the IR signals from the IR circuit and convert the IR signals into audio.