1. An operating area determination method, comprising: capturing at least one image of a target scene at a plurality of time points by at least one image capture device; generating a depth map of the target scene corresponding to each of the time points according to the at least one image; comparing a difference between at least two specific depth maps among the depth maps to identify a moving object in the at least one image and defining a position of the moving object in the at least one image as a reference point; obtaining one of the at least two specific depth maps; searching outward for a user's face in the obtained specific depth map using the reference point as a center, wherein a difference between a depth corresponding to the user's face and the specific depth corresponding to the reference point has not exceeded a preset value; defining a position of the user's face in the at least one image as a standard point; and determining an effective operating area for controlling an electronic apparatus in the target scene according to the reference point and the standard point defined in the at least one image.