An early warning system is provided. The early warning system includes a plurality of sensors, a server, and an information appliance device. The sensors produce status information. The server produces event information according to the status information of the sensors, transforms the event information into a first multimedia signal, and transmits the first multimedia signal to the information appliance device through a computer network. The information appliance device is connected to a display device, wherein the information appliance device transforms the first multimedia signal into a second multimedia signal capable of displaying through the display device. The disclosure further provides an early warning server, an early warning method, and a computer program product for report information.