A method for performing a method for performing a performing a face tracking function in an electric device is provided. The electric device has a touch panel, a camera, and a processor. The method includes the following steps. A touch signal is receiving by the touch panel. Under a video call, a face tracking mode is entered based on the touch signal by the processor. Face tracking is performed on a captured frame from the camera to obtain at least one region of interesting (ROI) of the captured frame by the processor, each of the ROI having an image of a face. A target frame is generated by combining the at least one ROI by the processor. The target frame is transmitted to another electric device by the processor, so that the target frame is shown on the another electric device as a video talk frame.