A method for controlling a digital television, DTV, (30, 40, 212, 650, 750), located in a room of a hotel among a plurality of independent hotel rooms physically separated from one another in the hotel, wherein a compact wireless device serves as a room key, and wherein the DTV includes an access point, AP, card (131, 210, 311, 600, 700), the method comprising: receiving an AP card wired equivalent privacy, WEP, key value recorded in a storage area of the compact wireless device, wherein the compact wireless device stores at least one of guest information, and hotel room information, and stores information of general wireless devices to be connected to the AP card, in a wireless LAN, WLAN, memory; receiving the WEP key value corresponding to the AP card of the DTV from a hotel management server; comparing the WEP key value received from a compact wireless device with the WEP key value received from the hotel management server; receiving ID information of a first general wireless device from the general wireless device if the WEP key values are identical each other; transmitting first general wireless device ID information received from a general wireless device to the compact wireless device, if the WEP key values are identical to each other; receiving an Internet service accept packet from the compact wireless device, if at least one second general wireless device ID information recorded in the storage area of the compact wireless device is identical to the first general wireless device ID information, wherein the first general wireless device ID information and the second general wireless device ID information are configured in a form of a combination of an ID number of a hotel room and a device name; and controlling the general wireless device to use an Internet service through the AP card of the DTV. receiving an AP card wired equivalent privacy, WEP, key value recorded in a storage area of the compact wireless device, wherein the compact wireless device stores at least one of guest information, and hotel room information, and stores information of general wireless devices to be connected to the AP card, in a wireless LAN, WLAN, memory; receiving the WEP key value corresponding to the AP card of the DTV from a hotel management server; comparing the WEP key value received from a compact wireless device with the WEP key value received from the hotel management server; receiving ID information of a first general wireless device from the general wireless device if the WEP key values are identical each other; transmitting first general wireless device ID information received from a general wireless device to the compact wireless device, if the WEP key values are identical to each other; receiving an Internet service accept packet from the compact wireless device, if at least one second general wireless device ID information recorded in the storage area of the compact wireless device is identical to the first general wireless device ID information, wherein the first general wireless device ID information and the second general wireless device ID information are configured in a form of a combination of an ID number of a hotel room and a device name; and controlling the general wireless device to use an Internet service through the AP card of the DTV.