Various embodiments of the present invention relate to an electronic device having an auxiliary device that can be attached/detached. The disclosed device comprises: a first electronic device having a touch screen arranged thereon; and a second electronic device arranged to be forced against at least a partial area of a surface of the touch screen such that data is input to the touch screen by a pressing operation, wherein the second electronic device may comprise a keypad unit, which comprises an array of multiple key tops that are pressed, and a substrate, which operates the touch screen by means of pressing of the key tops.