A method is provided for controlling a mobile device capable of accessing an AP card of a DTV located in one independent space among a plurality of independent spaces physically separated from one another. The method includes accessing a management server using the AP card, downloading an in-room control application from the management server, requesting a unique access code from the management server using the AP card if the downloaded in-room control application is executed, wherein the unique access code is mapped to both an ID of the AP card and an available term assigned to a current guest staying in the independent space, receiving the unique access code from the management server, and transmitting a command signal for changing a status of a controllable device contained in the independent space and the received unique access code to the AP card of the DTV.