A terminal for interactive telebroadcasting system comprising on the one hand a unit for adaptation to the physical telebroadcasting medium and on the other hand a control unit. The first unit comprises a receiver for receiving of a telebroadcast signal and for producing downstream information extracted from the signal, a transmission time based generator for generation of a transmission time base from the downstream information and a transmitter for transmission of a return signal, which are clocked as a function of the transmission time base. The second unit comprises a calculation unit having means of generating upstream information. The calculation unit is clocked as a function of the transmission time base.