A pen function method comprising: i) collecting information by a control unit, the collected information comprising: a) pen status information, b) function type information on a currently activated application program, and c) a gesture recognition information according to a gesture input operation of the touch pen; ii) identifying a pen function command corresponding to the collected information by accessing associated information in storage according to a particular set mode of one or more set modes; and iii) performing a function corresponding to the identified pen function command, wherein the pen status information includes information regarding an arrangement state between a pen recognition panel of a terminal that recognizes proximity of a touch pen according to the particular set mode, and recognizes the touch pen and state information on whether an actuator of the touch pen is activated, wherein accessing of associated information in the storage comprises accessing a pen function table in the storage which maps the pen function command with the pen status information, the function type information and the gesture recognition information, wherein identifying the pen function command comprises identifying the pen function command mapping with the collected information which is detected while or after the actuator is activated, wherein collecting information comprises collecting a key command input by the gesture input operation of the touch pen and predefined for activating a certain function, and performing a function comprises activating the function corresponding to the key command, and wherein collecting information comprises collecting a function support information which is input by the gesture input operation of the touch pen and applied to the function activated by the key command, and performing a function comprises applying the function support information to the activated function automatically. i) collecting information by a control unit, the collected information comprising: a) pen status information, b) function type information on a currently activated application program, and c) a gesture recognition information according to a gesture input operation of the touch pen; a) pen status information, b) function type information on a currently activated application program, and c) a gesture recognition information according to a gesture input operation of the touch pen; ii) identifying a pen function command corresponding to the collected information by accessing associated information in storage according to a particular set mode of one or more set modes; and iii) performing a function corresponding to the identified pen function command, wherein the pen status information includes information regarding an arrangement state between a pen recognition panel of a terminal that recognizes proximity of a touch pen according to the particular set mode, and recognizes the touch pen and state information on whether an actuator of the touch pen is activated, wherein accessing of associated information in the storage comprises accessing a pen function table in the storage which maps the pen function command with the pen status information, the function type information and the gesture recognition information, wherein identifying the pen function command comprises identifying the pen function command mapping with the collected information which is detected while or after the actuator is activated, wherein collecting information comprises collecting a key command input by the gesture input operation of the touch pen and predefined for activating a certain function, and performing a function comprises activating the function corresponding to the key command, and wherein collecting information comprises collecting a function support information which is input by the gesture input operation of the touch pen and applied to the function activated by the key command, and performing a function comprises applying the function support information to the activated function automatically. wherein the pen status information includes information regarding an arrangement state between a pen recognition panel of a terminal that recognizes proximity of a touch pen according to the particular set mode, and recognizes the touch pen and state information on whether an actuator of the touch pen is activated, wherein accessing of associated information in the storage comprises accessing a pen function table in the storage which maps the pen function command with the pen status information, the function type information and the gesture recognition information, wherein identifying the pen function command comprises identifying the pen function command mapping with the collected information which is detected while or after the actuator is activated, wherein collecting information comprises collecting a key command input by the gesture input operation of the touch pen and predefined for activating a certain function, and performing a function comprises activating the function corresponding to the key command, and wherein collecting information comprises collecting a function support information which is input by the gesture input operation of the touch pen and applied to the function activated by the key command, and performing a function comprises applying the function support information to the activated function automatically.