At present, the LED electronic display is widely applied in each kind of public area to announce all kinds of information. So it can make people feel facility, it can also expand the information audience.Display broadcast information needs regular replacement, and the methods are varied. In many cities,the present displays which are set up in the intersections of streets are quite scattered, and away from each others, so only the artificial update method is adopted. However, this approach relatively consumes more manpower and material resource. On the other hand it would cost much more time so that the information could not be broadcasted in time. A new idea of the information updating based on SMS (Short Messaging Service) is proposed in this paper. The GSM modems are all installed in controllers of the control center and the display terminals, and the GSM modems are controlled by the embedded software system to send and receive the message via AT commands. Therefore, the control center could send the updating information as SMS to all of display terminals in this way, and the terminals replace old information and broadcast the new information as soon as they received the news. This approach not only saves the manpower and the material resource, but also makes it possible to increase the information betimes.
