A display device, method, computer-readable storage medium and user interface, each of which detects contact to or proximity of an object with respect to a generated image, and responsive to detection of contact to or proximity of the object to the generated image, disables any operational functions associated with a first portion of the generated image. Additionally, operation associated with a second portion of the generated image is allowed responsive to the detection of contact to or proximity of the object to the generated image, where the second portion of the generated image is different from the first portion of the generated image. An indication corresponding to the second portion of the generated image for which operation is enabled may be displayed on the generated image.