VEHICLE-MOUNTED DISPLAY DEVICE, EXPANSION DEVICE, AND INDEPENDENT FUNCTIONAL DEVICE

The in-vehicle display device includes a central information display device 10, an extension device 20, and an individual functional device 30 formed separately from the central information display device 10. The individual functional device 30 includes a storage device for storing application software to execute the function of the central information display device 10. A CPU for executing the application software may be in the central information display device 10, the extension device 20, or the individual functional device 30.