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1. An image forming apparatus, comprising:
a connection portion to be connected to a keyboard, for performing communication with the keyboard; a display portion for performing displaying of disabled keys by displaying, when the keyboard is connected to the connection portion, a keyboard image representing the keyboard connected to the connection portion to show, within the keyboard image, usable keys and the disabled keys, which are unusable keys among keys provided to the keyboard, so as to indicate parts of the keyboard image corresponding to the disabled keys as the unusable keys; and an input portion for accepting input, wherein the input portion accepts input determining an actual count of times the disabled keys have been pressed or a count of the times the disabled keys have been pressed per unit time, and the display portion performs the displaying of the disabled keys when a count of times the disabled keys have been pressed exceeds a predetermined value of the actual count or the count of times the disabled keys have been pressed per unit time.
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