2. The digital television of claim 1 , wherein the controller is configured to display the first sub key button together with information about the predicted word on the display unit.
2. The digital television of claim 1 , wherein the controller is configured to display the first sub key button together with information about the predicted word on the display unit. 7. The digital television of claim 2 , wherein the controller is configured to: display the first and second alphabet characters of the predicted word in a first style, and display the rest of the alphabet characters of the predicted word in a second style different from the first style.