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A system, apparatus and method to control the output of a radio frequency signal in a wireless local area network (LAN) system having an infrastructure. The system includes an access point which periodically transmits a frame including output control information used to control the output of the rad

A system, apparatus and method to control the output of a radio frequency signal in a wireless local area network (LAN) system having an infrastructure. The system includes an access point which periodically transmits a frame including output control information used to control the output of the radio frequency signal, and a wireless terminal apparatus including a wireless transceiver module which receives the frame and a control module which extracts the output control information from the received frame, and controls the output of the radio frequency signal by the wireless transceiver module according to the extracted output control information.

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1. A method of controlling an output of a radio frequency signal in a wireless local area network (LAN) environment having an infrastructure, comprising: allowing an access point to sense a radio frequency signal in a predetermined frequency band; andtransmitting predetermined event information to a

1. A method of controlling an output of a radio frequency signal in a wireless local area network (LAN) environment having an infrastructure, comprising: allowing an access point to sense a radio frequency signal in a predetermined frequency band; andtransmitting predetermined event information to a network connected to the access point when the radio frequency signal is sensed by transmitting a frame containing output control information on the output of a radio frequency signal,wherein the output control information comprises information used to disable the output of a radio frequency signal. 2. The method of claim 1, wherein the predetermined event information comprises information to generate warning messages. 3. The method of claim 1, wherein the predetermined event information comprises information to broadcast warning messages. 4. The method of claim 1, wherein the predetermined frequency band comprises a frequency band assigned to a wireless LAN complying with an Institute of Electrical and Electronic Engineers (IEEE) 802.11 standard. 5. The method of claim 1, wherein the output control information comprises information on the access point. 6. The method of claim 1, wherein the output control information further includes information used to enable the output of a radio frequency signal. 7. An apparatus to control wireless local area network radio frequency (RF) signals, comprising: an access point that operates in either a transmission mode or a reception mode to control output of and/or monitor the radio frequency signals transmitted by the wireless local area network, the access point comprising: a reception part to sense an RF signal in a predetermined frequency band in a predetermined coverage area and to inform an administrator of the coverage area of the sensed output RF signal; anda transmission part to periodically output control information to interrupt the output of the RF signal. 8. The apparatus of claim 7, wherein the transmission mode and the reception mode are exclusively configured by an operator of the access point, and the access point provides a function that enables and disables the mode configuration. 9. The apparatus of claim 7, wherein the wireless local area network is a wireless terminal apparatus comprising a wireless transceiver module, a control module and a display module. 10. The apparatus of claim 7, wherein the output control information is contained in an RF control field of a beacon frame. 11. A method of controlling wireless local area network radio frequency (RF) signals, comprising: sensing RF signals of a predetermined frequency band transmitted within a predetermined coverage area; andtransmitting message information related to the sensed output RF signals to an administrator of the coverage area,wherein the message information includes information to generate and broadcast warning messages related to the predetermined frequency band of the sensed RF signals. 12. The method of claim 11, wherein the RF signals are sent from a wireless transceiver module of a wireless terminal apparatus.