A terminal for managing security, the terminal comprising: a touch screen configured to receive inputs from an electronic pen; a memory; and a controller configured to: in an electronic signature security registration mode: detect an input operation for an electronic signature by the electronic pen through the touch screen in a state where a button of the electronic pen is not pressed, display the electronic signature on the touch screen, after the electronic signature is displayed, detect coordinate values generated by a trace of the electronic pen during a re-input operation over at least a portion of the displayed electronic signature while an interruption is received by activation of the button of the electronic pen, wherein the interruption is transmitted by the electronic pen to the terminal when the button is pressed, and store, in the memory, the detected coordinate values and the electronic signature as electronic signature information; and in an electronic signature authentication process: in response to receiving a request to authenticate a received electronic signature, compare received electronic signature information with the electronic signature information stored in the memory, and perform a corresponding function according to a success of an authentication for the received electronic signature when the received electronic signature matches the electronic signature stored in the memory and coordinate values comprised in the received electronic signature information match the coordinate values stored in the memory. a touch screen configured to receive inputs from an electronic pen; a memory; and a controller configured to: in an electronic signature security registration mode: detect an input operation for an electronic signature by the electronic pen through the touch screen in a state where a button of the electronic pen is not pressed, display the electronic signature on the touch screen, after the electronic signature is displayed, detect coordinate values generated by a trace of the electronic pen during a re-input operation over at least a portion of the displayed electronic signature while an interruption is received by activation of the button of the electronic pen, wherein the interruption is transmitted by the electronic pen to the terminal when the button is pressed, and store, in the memory, the detected coordinate values and the electronic signature as electronic signature information; and detect an input operation for an electronic signature by the electronic pen through the touch screen in a state where a button of the electronic pen is not pressed, display the electronic signature on the touch screen, after the electronic signature is displayed, detect coordinate values generated by a trace of the electronic pen during a re-input operation over at least a portion of the displayed electronic signature while an interruption is received by activation of the button of the electronic pen, wherein the interruption is transmitted by the electronic pen to the terminal when the button is pressed, and store, in the memory, the detected coordinate values and the electronic signature as electronic signature information; and in an electronic signature authentication process: in response to receiving a request to authenticate a received electronic signature, compare received electronic signature information with the electronic signature information stored in the memory, and perform a corresponding function according to a success of an authentication for the received electronic signature when the received electronic signature matches the electronic signature stored in the memory and coordinate values comprised in the received electronic signature information match the coordinate values stored in the memory. in response to receiving a request to authenticate a received electronic signature, compare received electronic signature information with the electronic signature information stored in the memory, and perform a corresponding function according to a success of an authentication for the received electronic signature when the received electronic signature matches the electronic signature stored in the memory and coordinate values comprised in the received electronic signature information match the coordinate values stored in the memory.