A method and apparatus for displaying grouped display information by variable sizevariable-sized, grouped display information on a touch screen are provided. The apparatus includes an input unit that receives input from a user on a touch screen on which several pieces of display information are grouped and displayed in a predetermined number of groups, a determination unit that determines which group was input by calculating a location on the touch screen with respect to the user's input, and a display unit that displays the several pieces of display information in groups, and changes a size of the group region input as a result of the determination and the size of the other groups corresponding to the input group region size.