An apparatus and method for inputting a character on a touch keyboard in a terminal, in which a touch screen displays a basic key set and an extended key set, the basic key set including with consonant keys and the extended key set including character keys corresponding to characters combinable with a consonant corresponding to a consonant key input from the basic key set, and a controller for controlling the touch screen to display the extended key set, upon input of the consonant key from the basic key set, and receiving at least one character from the basic key set and the extended key set are provided.