Provided is an image display system. The image display system includes a host image processor, a sub image processor, and a power line communication carrier The host image processor processes a broadcasting signal received through a tuner, or an image signal received from an external image data generator so that the signal is displayable, and transmitting the same. The sub image processor displays an image signal transmitted from the host image processor. The power line communication carrier transmits/receives a signal between the host image processor and the sub image processor. The broadcasting signal received through the tuner of the host image processor being displayed by the sub image processor through the power line communication carrier