A method of operating a display device (1500, 1600), the method comprising: displaying a plurality of entities (120, 220) on an application selection screen, each entity (120, 220) enclosing at least one application icon (110, 210) in the inside, each application icon corresponding to a respective application; receiving a first input selecting one of the application icons (110, 210) within an entity enclosing at least one application icon, while continuing to display the application selection screen; executing the application corresponding to the selected application icon, in response to the first input; receiving a second touch input selecting a first entity of the plurality of entities (120, 220) and dragging the first entity to a second entity of the plurality of entities, wherein a first application icon is displayed inside the first entity, and a second application icon is displayed inside the second entity; determining a distance between the selected first entity and the second entity while selecting and dragging the first entity; displaying a first visual feedback informing that the selected first entity and the second entity will be merged if the selected first entity is released while the distance is less than a first threshold distance; merging the first entity with the second entity to create a merged entity and displaying the first application icon and the second application icon inside the merged entity if the selected first entity is the released while the distance is less than the first threshold distance while continuing to display the remaining entities and all their enclosed application icons; and displaying a second visual feedback informing that the merging is cancelled if the selected first entity is dragged further apart from the second entity than a second threshold distance while the first visual feedback is displayed. displaying a plurality of entities (120, 220) on an application selection screen, each entity (120, 220) enclosing at least one application icon (110, 210) in the inside, each application icon corresponding to a respective application; receiving a first input selecting one of the application icons (110, 210) within an entity enclosing at least one application icon, while continuing to display the application selection screen; executing the application corresponding to the selected application icon, in response to the first input; receiving a second touch input selecting a first entity of the plurality of entities (120, 220) and dragging the first entity to a second entity of the plurality of entities, wherein a first application icon is displayed inside the first entity, and a second application icon is displayed inside the second entity; determining a distance between the selected first entity and the second entity while selecting and dragging the first entity; displaying a first visual feedback informing that the selected first entity and the second entity will be merged if the selected first entity is released while the distance is less than a first threshold distance; merging the first entity with the second entity to create a merged entity and displaying the first application icon and the second application icon inside the merged entity if the selected first entity is the released while the distance is less than the first threshold distance while continuing to display the remaining entities and all their enclosed application icons; and displaying a second visual feedback informing that the merging is cancelled if the selected first entity is dragged further apart from the second entity than a second threshold distance while the first visual feedback is displayed.