a preferred embodiment of the present invention this apparatus includes a mobile communication terminal 100 such as a notebook a pda or a cellular phone for receiving wireless data from a mobile communication system b a base transceiver station bts 200 for performing wireless communications with the mobile communication terminal 100 a base station controller bsc 300 connected to the base transceiver station 200 for controlling each base transceiver station 200 and a mobile switching center msc 400 connected to a number of the base station controllers 300 for controlling the whole system the system further includes a home location register hlr 410 and a visitor location register vlr 420 which perform an authentication process of the mobile communication terminal 100 and a broadcast center 500 connected to the mobile communication system b for providing broadcast data for the wireless data service the wireless data provided in broadcast center 500 is transmitted to mobile switching center 400 of the mobile communication system b if the wireless data received from the broadcast center is charged service data requiring authentication the mobile switching center 400 assigns a walsh code and a long code mask key as the authentication code informs the base transceiver station 200 of this code and transmits the wireless data to the base transceiver station in the base transceiver station 200 the.