Abstract: An apparatus of displaying an image connects an external device by using universal serial bus (USB) connection. The apparatus contains a display unit and a control unit that reads device information out of the connected external device and performs display control on the display unit based on the read device information. Under control of the control unit, the display unit displays a message that is used for changing a class of the external device to a class previously specified in the apparatus of displaying the image when the class of the external device is changeable and it is determined based on the device information that the set class of the external device is different from the class previously specified in the apparatus of displaying the image.

Abstract: An apparatus of displaying an image connects an external devise by using universal serial bus (USB) connection. The apparatus contains a display unit and a control unit that reads device information out of the connected external device and performs display control on the display unit based on the read device information. Under control of the control unit, the display unit displays a message that is used for changing a class of the external device to a class previously specified in the apparatus of displaying the image when the class of the external device is changeable and it is determined based on the device information that the set class of the external device is different from the class previously specified in the apparatus of displaying the image.