sub ui elements are displayed adjacent to the selected ui element so that a user selects a desired sub ui element from the sub menu with minimum movement if a user takes his or her finger off of the touched area the touchscreen 180 concurrently displays a ui element and sub menus of the ui element as described in fig4 b and 4c accordingly a user can recognize a correspondence between a ui element and sub menus without having to carry out an additional operation fig5 a to 5c are views explaining a method of displaying ui elements differently arranged based on a viewable area according to an embodiment of the present invention the ui elements of fig5 a to 5c correspond to the sub ui elements of the sub menu of fig4 a to 4d if a user selects a desired ui element the touchscreen 180 displays only the sub menu corresponding to the selected ui element various methods for displaying sub menus will be explained below fig5 a is a view explaining a method of displaying a ui element when a user holds an electronic apparatus in his or her left hand and manipulates the electronic apparatus with his or her left thumb when the user holds the electronic apparatus in his or her left hand the control unit 190 detects an un viewable area located on a left portion of the touchscreen 180 more specifically the control unit 190 detects that the vector for touch 370 is directed from a left portion toward a right upper end of the touchscreen 180 therefore the control unit 190 displays respective.