Apparatus and method for changing call mode in portable terminal

PURPOSE: An apparatus and method for changing a call mode in a portable terminal are provided to change a video call mode into a voice call mode or a voice call mode into a video call mode through an external key. CONSTITUTION: According to an input of an external key, a control unit(100) confirms a current call mode. The control unit changes the current communication mode into a voice call mode or a video call mode. According to the input of an external key, a call mode management unit(102) performs a call mode change process. An external input sensing unit(104) provides the input of the external key to the call mode management unit. If the input of the external key is sensed, a call mode confirmation unit(106) confirms the call mode of a portable terminal.