23. The display apparatus according to claim 22 , further comprising an inputter configured to receive a pinch operation from a user to decrease the size of the character and an expansion operation to increase the size of the character, wherein the controller is configured to, in response to the inputter receiving the pinch operation, decrease at least one of a size and a thickness of the font effect, and in response to the inputter receiving the expansion operation, increase at least one of the size and the thickness of font effect.
23. The display apparatus according to claim 22 , further comprising an inputter configured to receive a pinch operation from a user to decrease the size of the character and an expansion operation to increase the size of the character, wherein the controller is configured to, in response to the inputter receiving the pinch operation, decrease at least one of a size and a thickness of the font effect, and in response to the inputter receiving the expansion operation, increase at least one of the size and the thickness of font effect. 24. The display apparatus according to claim 23 , the controller is configured to, in response to the inputter receiving the pinch operation, decrease at least one of the size and the thickness of the font effect in proportion to the decrease in the size of the character, and in response to the inputter receiving the expansion operation, increase at least one of the size and the thickness of font effect in proportion to the increase in the size of the character.