1. A vehicle privacy region-masking device comprising: a computer, comprising a vehicle black box visually recording an interior of a vehicle, the vehicle black box comprising: a masking region configuration logic module for automatically constructing a masking region of an internal image of a vehicle; a key management logic module for creating and managing a masking key which is used for masking the masking region on the internal image of the vehicle; and a masking execution logic module for masking the masking region on the internal image using the masking key, to generate a masked image, and wherein the masking region configuration logic module constructs a part of the internal image as the masking region, which is predefined under consideration of an inner space of the vehicle or a passenger within the vehicle.