1. A method for controlling a digital television (DTV) located in one independent space among a plurality of independent spaces physically separated from one another, wherein the DTV includes an access point (AP) card, the method comprising: receiving guest information recorded in a storage area of a wireless communication unit and a wired equivalent privacy (WEP) key value of the AP card; receiving the WEP key value corresponding to the AP card of the DTV and a broadcast signal from a management server; comparing the WEP key value received from the wireless communication unit with the WEP key value received from the management sever by the access point; generating at least one recommendation service information dependent on the guest information based on the information stored in the storage area of the wireless communication unit and the management server; processing the received broadcast signal using middleware platform embedded in the DTV, wherein the middleware platform supplements user interface and access point interface (UI & API), and further separates the UI & API layer into system layer and API layer; and outputting audio/video (A/V) data on the basis of the processed broadcast signal and displaying the generated recommendation service information in the DTV, wherein the middleware platform includes: a switching layer for switching a first layer for processing a broadcast signal based on a broadcast system of a first region and a second layer for processing a broadcast signal based on a broadcast system of a second region; a flexible Digital Rights Management (DRM) layer capable of being voluntarily modified; and a downloadable engine layer capable of voluntarily programming an interactive service application.