A mobile terminal comprising: a touch screen; and a processor configured to: execute an application, display, on the touch screen, a first keypad of a basic form associated with the application on a screen of the application based on a first input during displaying the screen of the application, receive a second input for setting a one-hand operation mode while the application is executed, in response to receiving the second input for setting the one-hand operation mode, display a second keypad (760, 770) biased towards a first direction relative to a center of the screen and having a reduced size of the first keypad, a first additional information output area, and a first change item (762, 772) for changing a location of the second keypad (760, 770) from the first direction to a second direction relative to the center of the screen, receive a third input for selecting the first change item (762, 772) while displaying the second keypad (760, 770) and the first change item, and in response to receiving the third input for selecting the first change item (762, 772), change the location of the second keypad (760, 770) by displaying the second keypad (760, 770) biased towards the second direction opposite to the first direction, a second additional information output area, and a second change item (772, 762) for changing a location of the second keypad (760, 770) from the second direction to the first direction relative to the center of the screen, wherein a size and a location of the second keypad (760, 770) are determined based on preset information on a one-hand operation range of a user, and wherein each of the first keypad and the second keypad (760, 770) includes a plurality of keys associated with the application, and a size of respective keys on the second keypad (760, 770) are relatively smaller than a size of respective keys on the first keypad. a touch screen; and a processor configured to: execute an application, display, on the touch screen, a first keypad of a basic form associated with the application on a screen of the application based on a first input during displaying the screen of the application, receive a second input for setting a one-hand operation mode while the application is executed, in response to receiving the second input for setting the one-hand operation mode, display a second keypad (760, 770) biased towards a first direction relative to a center of the screen and having a reduced size of the first keypad, a first additional information output area, and a first change item (762, 772) for changing a location of the second keypad (760, 770) from the first direction to a second direction relative to the center of the screen, receive a third input for selecting the first change item (762, 772) while displaying the second keypad (760, 770) and the first change item, and in response to receiving the third input for selecting the first change item (762, 772), change the location of the second keypad (760, 770) by displaying the second keypad (760, 770) biased towards the second direction opposite to the first direction, a second additional information output area, and a second change item (772, 762) for changing a location of the second keypad (760, 770) from the second direction to the first direction relative to the center of the screen, execute an application, display, on the touch screen, a first keypad of a basic form associated with the application on a screen of the application based on a first input during displaying the screen of the application, receive a second input for setting a one-hand operation mode while the application is executed, in response to receiving the second input for setting the one-hand operation mode, display a second keypad (760, 770) biased towards a first direction relative to a center of the screen and having a reduced size of the first keypad, a first additional information output area, and a first change item (762, 772) for changing a location of the second keypad (760, 770) from the first direction to a second direction relative to the center of the screen, receive a third input for selecting the first change item (762, 772) while displaying the second keypad (760, 770) and the first change item, and in response to receiving the third input for selecting the first change item (762, 772), change the location of the second keypad (760, 770) by displaying the second keypad (760, 770) biased towards the second direction opposite to the first direction, a second additional information output area, and a second change item (772, 762) for changing a location of the second keypad (760, 770) from the second direction to the first direction relative to the center of the screen, wherein a size and a location of the second keypad (760, 770) are determined based on preset information on a one-hand operation range of a user, and wherein each of the first keypad and the second keypad (760, 770) includes a plurality of keys associated with the application, and a size of respective keys on the second keypad (760, 770) are relatively smaller than a size of respective keys on the first keypad.