A programmable logic IC and a ROM are set in a controller section between a display and ICs (an IC for wireless communication and an IF IC). In each of plural program sets stored in the ROM, a series of operation up to the time that image data, after being read from the IC for wireless communication and converted into a logic signal, is sent to the display is described. On the other hand, the programmable logic IC changes the program set being read, according to what is displayed on the display, television images, a monitor image supplied from a computer, or image data from a memory card. This makes it possible to attain an image-display-device controller circuit that has a small circuit scale, consumes a small amount of power, and is small in size and weight are small, but can change operation.