A method for providing a Graphic User Interface (GUI) and a touch screen-based mobile device adapted thereto permit the user to be notified that additional items are available for display. The method preferably includes: determining whether there is an item to be displayed, other than at least one item arranged in an item display allocation area; and displaying, when there is an item to be displayed, an image object, shaped as a certain shape, at a boundary portion of the item display allocation area at which the item to be displayed is created. The intensity, color, pattern, etc. of the image at the boundary can be varied in accordance with the number and urgency of non-displayed items.