A portable apparatus comprising a portable terminal and a pen, the portable terminal comprising a controller, a touch panel, and a display unit: wherein the pen includes a button and the pen is arranged to be set to a first input state in which the pen tip carries a first level of electrical charge or to a second input state in which the pen tip carries a second level of electrical charge depending on whether or not the button has been pressed; wherein the touch panel includes a touch sensor arranged to distinguish between the first and second levels of electrical charge in response to being touched by the pen or the pen approaching the touch panel and according to the level of electrical charge carried by the pen tip, the touch panel being arranged to generate a first input signal or a second input signal depending upon the distinguished level of electrical charge, wherein the controller is arranged to analyse (417, 421) the first or second input signal, to determine a first input or second input depending upon the first or second input signal, to perform a pre-set function corresponding to the first input in an executed application, and to call a pre-set application or perform a pre-set command corresponding to the second input; wherein the display unit is arranged to display a screen processed according to at least one of the first input and the second input under the control of the controller; wherein the first input includes at least one of a general input that controls operation of the executed application, a handwritten letter and a drawing, and the second input is a command that calls a predetermined application and/or a command for execution of a predetermined operation; wherein in response to determining a general input, the controller is arranged to perform different functions according to an input type of the general input; and wherein in response to determining a second input, the controller is arranged to perform different commands according to an input type of the second input. wherein the pen includes a button and the pen is arranged to be set to a first input state in which the pen tip carries a first level of electrical charge or to a second input state in which the pen tip carries a second level of electrical charge depending on whether or not the button has been pressed; wherein the touch panel includes a touch sensor arranged to distinguish between the first and second levels of electrical charge in response to being touched by the pen or the pen approaching the touch panel and according to the level of electrical charge carried by the pen tip, the touch panel being arranged to generate a first input signal or a second input signal depending upon the distinguished level of electrical charge, wherein the controller is arranged to analyse (417, 421) the first or second input signal, to determine a first input or second input depending upon the first or second input signal, to perform a pre-set function corresponding to the first input in an executed application, and to call a pre-set application or perform a pre-set command corresponding to the second input; wherein the display unit is arranged to display a screen processed according to at least one of the first input and the second input under the control of the controller; wherein the first input includes at least one of a general input that controls operation of the executed application, a handwritten letter and a drawing, and the second input is a command that calls a predetermined application and/or a command for execution of a predetermined operation; wherein in response to determining a general input, the controller is arranged to perform different functions according to an input type of the general input; and wherein in response to determining a second input, the controller is arranged to perform different commands according to an input type of the second input.