channels for main and sub pictures fig2 is a flowchart illustrating a dual dmb multichannel scanning procedure of a multichannel scanning method according to the present invention and fig3 is a flowchart illustrating a single dmb multichannel scanning procedure of a multichannel scanning method according to the present invention referring to fig1 and 2 in an idle mode s 201 the controller 110 determines whether the t dmb or the s dmb operates in a normal operation state s 203 in the normal operation state the s dmb tuner 141 and the t dmb tuner 142 receive the broadcast signals through the s dmb and t dmb antennas 100 and 105 and the s dmb and t dmb processors 150 and 151 perform demodulation and decoding of the s dmb and t dmb signals output from the s dmb and t dmb tuners 141 and 142 the decoded s dmb and t dmb signals are stored in the first memory 120 and separately decoded by the s dmb and t dmb codecs 160 and 161 so as to be output as video and audio signals the s dmb and t dmb video and audio signals are stored in a second memory 122 the s dmb and t dmb audio signals are processed by the audio processing unit 125 so as to be output through the speaker and the s dmb and t dmb video signals are processed by the video processing unit 170 so as to be output through the display 180 if the t dmb and s dmb operate in the normal operation state the controller 110 determines whether a key.