An electronic display board apparatus configured to provide an operation key, includes a display with a touch panel function on which an application image is displayed; a mode change accepting unit which accepts an operation mode for the touch panel function, the operation mode including a simple operation mode; an image analyzing unit which detects an operational image associated with an operational function from the application image displayed on the display at the simple operation mode; a key allocation unit which allocates the operation key to the operational image detected by the image analyzing unit so that an operation of the allocated operation key is treated as an operation to the operational image at the simple operation mode; and a touch panel control unit which suppresses the touch panel function of at least a part where the operational image is displayed at the simple operation mode.