A video display apparatus capable of communicating with an external controller includes a microcontroller for receiving commands from an external controller, a first non-volatile memory for storing data relating to the video display apparatus, first bus line for connecting the external controller with the microcontroller and the first non-volatile memory, a second non-volatile memory for storing the same data that is stored in the first non-volatile memory, and second bus lines for connecting the second non-volatile memory with the microcontroller.