The present invention relates to a deadline-based real-time traffic queue service apparatus in an ATM network in which real-time traffic and data traffic can be efficiently accommodated using an amplifier flag signal in a deadline-based queue service scheme, Th to n-th FIFOs 9 to n for inputting data from a plurality of virtual channels (VC0 to VCn) and outputting an amplifier flag signal (EF); (RT0 to RTn) based on the amplifier flag signals EF0 to EFn from the 0th to nth FIFOs 9 to n and the virtual channel signal VC_sel from the comparator 40 0 to n th dead time generating means (29 to n); Comparison means (40) for comparing the finishing time (RT0 to RTn) from the 0th to nth finishing time generating means (29 to n) and sequentially outputting the minimum time; And a multiplexer 20 for selectively outputting a connection new identifier (CID) from the 0th to nth FIFOs 9 to n by a virtual channel signal VC_sel from the comparison means 40 do.
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