Abstract: The synchronous briefing or visual playback in different areas and capability of receiving multiple image sources are achieved by connecting various briefing subsystems in different areas via the Internet. One or more image sources are configured in each briefing subsystem and each connected to a server of the subsystem via physical or wireless network. The server of each briefing subsystem transmits briefing or image data to a playback device for outputting purpose via physical or wireless network. The internet-connected servers in all the briefing subsystems are capable of transmitting briefing or image data to one another via the Internet such that briefing or image outputting in one subsystem can be synchronously performed in other subsystems.