The invention relates to a real time processing and management method for canceling out the echo between a loudspeaker (HP) and a microphone (M) of a computer terminal. Said method consists of establishing the loudspeaker signal or the microphone signal as a reference signal and synchronizing (A) the other signal with said reference signal, and (B) synchronizing the acquisition and audio reestablishment tasks. The delay that exists (re.sub.j) between the other signal and the reference signal is measured (C) and the existing delay value (re.sub.j) is validated (D) in order to control the delay applied to the reference signal starting from the current delay (re.sub.j). The invention can be used for computer terminals which are equipped with multi-tasks operating systems.