The present disclosure relates to a device authentication method as a procedure designed for authenticity of an apparatus. A connecting apparatus to be authenticated and an authentication box are connected to a trusted network through which authentication information is received by the connecting apparatus. The connecting apparatus is electrically connected to a non-trusted network through which the connecting apparatus and an intermediary server are electrically connected with each other; a virtual hub network is created by the intermediary server and electrically connected to both the authentication box and the connecting apparatus such that the connecting apparatus is authenticated by authentication box based on the authentication information.