A handphone including a phone body and a cover and which is capable of inputting characters using both a keypad installed on the phone body and an extra keypad installed on the cover in the manner in which characters are input through a computer keyboard. The phone body has a display device and a keypad including a plurality of keys. The cover covers the phone body and includes a second keypad including a plurality of keys. The first and second keypads are functionally coupled together to input characters. The handphone has a keyboard structure, such as a computer keyboard, formed by functionally coupling the auxiliary keypad of the cover to the keypad of the phone body. In this structure, characters can be input similar to the way that characters are input through a computer keyboard, so that significantly faster character input is possible.