A method for automatic synchronization between the reproduction, by a first equipment item, of multimedia content comprised in a broadcast program comprising a soundtrack and the display of enriched content associated with the multimedia content on a screen of a second equipment item able to be connected to a communication network, said enriched content being transmitted automatically to the second equipment item by at least one computer server of said communication network, said method comprising: - a step, prior to the reproduction of the multimedia content by the first equipment item, during which at least one audio signature corresponding to an excerpt of the soundtrack unequivocally representing the broadcast multimedia content is generated and stored in a database connected to said computer server, said audio signature being transmitted automatically for storage to the second equipment item by said computer server; and during the broadcasting of the program by a remote source, the broadcast program being received and reproduced by the first equipment item: - a step for listening by a microphone of the second equipment item to an audio signal generated by the first equipment item during the reproduction of the soundtrack of the broadcast program, and identifying the reproduction instant (tc) of the multimedia content by comparing the listened to audio signal with the stored audio signature; - a step for determining a synchronization period at the end of which the enriched content must be displayed on the screen of the second equipment item, and - a step for displaying said enriched content on the screen of the second equipment item at the end of the synchronization period; the method being characterized in that it further includes a step for automatic transmission, by said at least one computer server to the second equipment item via the communication network, of an information item comprising a reference instant (t REF) corresponding to the instant at which the multimedia content is actually broadcast by the remote source, said information being generated by a content management module by listening to sources broadcasting programs and recognition of the multimedia content by identification of the stored audio signature, and transmitted to said at least one computer server via the communication network; in that the reception of said information comprising the reference instant (t REF) by the second equipment item triggers said listening step, and in that the synchronization period is determined as a function only of the difference between the reference instant (t REF) and the identified reproduction instant (tc). - a step, prior to the reproduction of the multimedia content by the first equipment item, during which at least one audio signature corresponding to an excerpt of the soundtrack unequivocally representing the broadcast multimedia content is generated and stored in a database connected to said computer server, said audio signature being transmitted automatically for storage to the second equipment item by said computer server; and - a step for listening by a microphone of the second equipment item to an audio signal generated by the first equipment item during the reproduction of the soundtrack of the broadcast program, and identifying the reproduction instant (tc) of the multimedia content by comparing the listened to audio signal with the stored audio signature; - a step for determining a synchronization period at the end of which the enriched content must be displayed on the screen of the second equipment item, and - a step for displaying said enriched content on the screen of the second equipment item at the end of the synchronization period; the method being characterized in that it further includes a step for automatic transmission, by said at least one computer server to the second equipment item via the communication network, of an information item comprising a reference instant (t REF) corresponding to the instant at which the multimedia content is actually broadcast by the remote source, said information being generated by a content management module by listening to sources broadcasting programs and recognition of the multimedia content by identification of the stored audio signature, and transmitted to said at least one computer server via the communication network; in that the reception of said information comprising the reference instant (t REF) by the second equipment item triggers said listening step, and in that the synchronization period is determined as a function only of the difference between the reference instant (t REF) and the identified reproduction instant (tc).