1. A character correcting method of a display apparatus, the character correcting method comprising: displaying a sentence comprising at least two words at a first area in which a character input window is displayed; displaying, if one of the at least two words is selected at the first area, a first user interface (UI) at a third area in which the at least one selected word is displayed by a character unit; and displaying, if one of a plurality of characters displayed in the first UI is selected, a second UI at a top and a bottom of the selected character at the third area, the second UI is configured to edit the selected character.