10. The display device according to claim 1 , wherein the processor further deletes the text displayed in the text preview interface in response to a third touch input, and an amount of the text which is deleted is determined on the basis of a predetermined preview font size and a length of the third touch input.
10. The display device according to claim 1 , wherein the processor further deletes the text displayed in the text preview interface in response to a third touch input, and an amount of the text which is deleted is determined on the basis of a predetermined preview font size and a length of the third touch input. 11. The display device according to claim 10 , wherein, when the text displayed in the text preview interface is deleted, the processor displays a text of the amount corresponding to the deleted text in next portion of the last text displayed in the text preview interface.