The system for automatic planning of delays in a network (N) of SFN type comprises: means initiating an OFDM transmission for each radio transmitter (4), inter-symbol delays being provided; a calculation module processing network data and determining figures of populations located in zones with interference; control means and initiation means to delay transmission at each transmitter, with a delay varying between 0 and 1 ms; delay adjustment means linked to the control means for combinations of delays for all transmitters. The module (11) recalculates the figures of populations located in interference zones for successive combinations of delays, and configuration means (13) of the system provide the number of permitted iterations. The optimal combination is obtained when said estimated population figures are minimum.