The present disclosure provides a host electronic device including a main operating circuit, a first peripheral bus, an interface circuit, a second peripheral bus, and a conversion device. The interface circuit is coupled between the second peripheral bus and a host computer for receiving an external command form the host computer through a transmission protocol compatible with a first interface. The conversion device is coupled between the first and the second peripheral bus including an external virtual adapter, an internal virtual adapter, and a network channel. Furthermore, the conversion device encodes and decodes the external command, and produces a decoded external command. A processor of the main operating circuit executes the decoded external command, such that the main operating circuit implements a corresponding operation.