A mobile terminal, comprising: a case, including a front case, a rear case and a rear cover, wherein a portion of the case is formed of a metallic material; a metal key unit (300, 310, 320, 330, 350, 360, 370, 300') coupled to the case, wherein the metal key unit includes a plurality of metal keys, which are formed on at least one of the rear case, the front case, and the rear cover; and wherein each metal key includes a flexible printed circuit board coupled to an inner surface of the part of the case where the metal key is formed, and a pressure sensor configured to sense pressure received at the metal key; and a display (151, 251) located on the front case; and a controller configured to: recognize pressure of a touch input received at the metal key unit (300, 310, 320, 330, 350, 360, 370, 300'); determine whether the touch input applied to the metal key unit (300, 310, 320, 330, 350, 360, 370, 300') has a pressure larger than a reference pressure of a single touch input; recognize a position by sensing which of the plurality of metal keys has sensed the pressure of the single touch input; execute a specific function based on the recognized pressure of the single touch input, characterised in that the controller is further configured to: control the display (151, 251) to output a graphic image to a region of the display (151, 251) corresponding to the recognized position, the graphic image including information relating to the execution of the specific function, and to sense a position of a user's hand which holds the mobile terminal if the touch input does not have a pressure larger than the reference pressure. a case, including a front case, a rear case and a rear cover, wherein a portion of the case is formed of a metallic material; a metal key unit (300, 310, 320, 330, 350, 360, 370, 300') coupled to the case, wherein the metal key unit includes a plurality of metal keys, which are formed on at least one of the rear case, the front case, and the rear cover; and wherein each metal key includes a flexible printed circuit board coupled to an inner surface of the part of the case where the metal key is formed, and a pressure sensor configured to sense pressure received at the metal key; and a display (151, 251) located on the front case; and a controller configured to: recognize pressure of a touch input received at the metal key unit (300, 310, 320, 330, 350, 360, 370, 300'); determine whether the touch input applied to the metal key unit (300, 310, 320, 330, 350, 360, 370, 300') has a pressure larger than a reference pressure of a single touch input; recognize a position by sensing which of the plurality of metal keys has sensed the pressure of the single touch input; execute a specific function based on the recognized pressure of the single touch input, characterised in that the controller is further configured to: control the display (151, 251) to output a graphic image to a region of the display (151, 251) corresponding to the recognized position, the graphic image including information relating to the execution of the specific function, and to sense a position of a user's hand which holds the mobile terminal if the touch input does not have a pressure larger than the reference pressure. recognize pressure of a touch input received at the metal key unit (300, 310, 320, 330, 350, 360, 370, 300'); determine whether the touch input applied to the metal key unit (300, 310, 320, 330, 350, 360, 370, 300') has a pressure larger than a reference pressure of a single touch input; recognize a position by sensing which of the plurality of metal keys has sensed the pressure of the single touch input; execute a specific function based on the recognized pressure of the single touch input, characterised in that the controller is further configured to: control the display (151, 251) to output a graphic image to a region of the display (151, 251) corresponding to the recognized position, the graphic image including information relating to the execution of the specific function, and to sense a position of a user's hand which holds the mobile terminal if the touch input does not have a pressure larger than the reference pressure. control the display (151, 251) to output a graphic image to a region of the display (151, 251) corresponding to the recognized position, the graphic image including information relating to the execution of the specific function, and to sense a position of a user's hand which holds the mobile terminal if the touch input does not have a pressure larger than the reference pressure.