1. A digital display device, comprising: a user input unit to receive control signals corresponding to a user operation, the control signals to control a plurality of images to be continuously displayed; a display controller including an image arrangement unit, the display controller to output display signals by storing image files or processing the stored image files according to the control signals; a storage unit having image files stored therein; and a display unit to display the plurality of images on a screen according to the display signals, the image arrangement unit to arrange the plurality of images in an arrangement order for display based on comparison results that compare data for pairs of images selected from the plurality of images upon the control signals being input.