1. A data input apparatus, comprising: an image input module to obtain an input image representing at least one selectable input; and a controller to control a binarizing of at least one respective digital image of at least one respective input from the obtained input image, and to determine selection by a user of the at least one respective selectable input based on a comparison of a corresponding binarized image of the at least one respective digital image with a corresponding previously stored binarized image, wherein binarized images are converted grayscale digital images that have been converted from respective grayscale images to binary images having only a maximum scale and a minimum scale to represent an intensity of each pixel.