is converted to the active mode then the first control unit 150 outputs an activating signal to the second control unit 130 to activate the second control unit 130 and in turn is converted to the sleep mode again the switching unit 120 may be implemented as an analog switch in an exemplary embodiment of the present invention in an exemplary embodiment of the present invention the second control unit 130 includes a multimedia processor for performing a multimedia function of the portable terminal the multimedia function refers to a function of processing various media including voices figures pictures etc the key input unit 140 includes character keys numeric keys various function keys and external volume control buttons and outputs key input signals corresponding to the user 39 s key input to the control unit 150 the first control unit 150 e g a mobile station modem msm chip controls overall operations of the portable terminal according to an exemplary embodiment of the present invention the display unit 160 may include a liquid crystal display lcd etc and outputs various display data generated by the portable terminal the memory unit 170 may include program memories and data memories and stores a wide variety of information required to control the operation of the portable terminal.