The present invention relates to a DTMF signal interference elimination apparatus for preventing a DTMF signal from a counterpart from being interfered by a guidance message output via a CO line in a communication terminal having an automatic response function.;According to the present invention, in a communication terminal having an automatic response function including a guidance message storage unit storing guidance message data and a modem for outputting a guidance message signal read out from the guidance message storage unit via a trunk line, A data output unit for receiving a guide message from the first buffer via a DC coupling capacitor and outputting the received message via the DC coupling capacitor, a data output unit for outputting the level of the guidance message signal and the signal level A synthesizer for receiving a synthesized signal of a guide message signal obtained at the previous stage of the resistor, a guidance message on the CO line and a DTMF signal from the other party, and extracting only the DTMF signal, a buffer for amplifying only the DTMF signal, And a second buffer for applying the second buffer.
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