1. An apparatus, comprising: a touch-screen; and at least one processor coupled to the touch-screen, wherein the at least one processor is configured to: control the touch-screen to display a user interface (UI) including an object capable of inputting text data; detect an input means of a first type over the object by a user, wherein an end of the input means of the first type is positioned in a first position spaced apart from the object being displayed in the touch-screen; in response to detecting, the input means of the first type, control the touch-screen to display, in the object, a visual affordance for guiding that the object is capable of receiving a handwritten text inputted by the user; detect an input means of a second type over the object by the user, wherein the end of the input means of the second type is moved from the first position in contact with the object to a second position in which the visual affordance is displayed; in response to detecting, the input means of the second type, control the touch-screen to display an input area and a result area which are superimposed on the object, wherein the input area is usable for receiving the handwritten text; and in response to receiving the handwritten text on the input area, display the handwritten text in the input area and display a text in the result area with a designated font changed from the handwritten text.