1. A display device for converting voice data to a text the display device comprising: a storage unit configured to store the voice data; a display unit configured to display the text; a sensor unit configured to detect a touch input to the display unit; and a processor configured to: convert the voice data to the text, display the converted text in the display unit, display a text preview interface in response to a first touch input, wherein the text preview interface previews at least a part of the text converted from the voice data in the display unit, detect a second touch input, wherein the second touch input corresponds to drag touch input including a length, determine an amount of the text displayed in a text output interface based on a predetermined output font size and the length of the second touch input, display the text in the text output interface in response to the second touch input, wherein the text output interface displays the text which is a part of displayed the text preview interface in the display unit, and provide different graphic effects to the text preview interface from the text output interface when the text output interface is displayed.
1. A display device for converting voice data to a text the display device comprising: a storage unit configured to store the voice data; a display unit configured to display the text; a sensor unit configured to detect a touch input to the display unit; and a processor configured to: convert the voice data to the text, display the converted text in the display unit, display a text preview interface in response to a first touch input, wherein the text preview interface previews at least a part of the text converted from the voice data in the display unit, detect a second touch input, wherein the second touch input corresponds to drag touch input including a length, determine an amount of the text displayed in a text output interface based on a predetermined output font size and the length of the second touch input, display the text in the text output interface in response to the second touch input, wherein the text output interface displays the text which is a part of displayed the text preview interface in the display unit, and provide different graphic effects to the text preview interface from the text output interface when the text output interface is displayed. 16. The display device according to claim 1 , wherein the processor displays the text preview interface to one of lower, upper, left and right sides of the first touch input.