An apparatus and method are provided for inputting a character in a mobile communication terminal which displays character items representing types of characters on a screen of the mobile communication terminal in order for a user to select a type of character to be input in a character input mode. The apparatus and method comprise mapping each of the character items to each of predetermined keys included in a keypad and displaying mapped items, when the mobile communication terminal enters the character input mode; and setting predetermined characters to be display characters for displaying on the screen when a predetermined key signal is input while a preset key signal is input, the predetermined characters being included in a character item corresponding to the predetermined key signal, the predetermined key signal corresponding to one of the displayed character items.