A projection television set having an enclosure housing a screen, an optical unit and a mirror, wherein the optical unit and mirror are capable of projecting an image onto the screen. When the electronic device is locked, the icons are moving on the display device, and the moving icons is highlighted one by one according to a moving direction and a time interval. The signal processor also analyzes the signals received from other vehicles within the communication range and determines from the identifier and the positional coordinates data when another vehicle is ready to perform a joint operation with the vehicle. The first and second spindle circumferential surfaces may engage the first and second circumferential surfaces, respectively. The image processing section 7 has a first grouping section 74A for comparing the spectral characteristic of each part with the standard spectral characteristics of the specific parts to divide the parts into groups corresponding to the specific parts.