A method of inserting at least one component into an original data stream, organised in successive packets, which is intended to provide a modified stream to be broadcast by a subassembly of at least one transmitter of a broadcasting network comprising at least two distinct transmitters (E11 1, E11 2) using one and the same transmission frequency characterised in that it comprises: - a step of constructing at least one file to be inserted comprising at least one component to be inserted, and at least one insertion description file comprising at least one time stamping cue (I 1) for said component or components to be inserted, said time stamping cue (I 1) defining the instant of insertion and/or the transmission cycle of this component in the original data stream, - a step of synchronously inserting into said original digital stream, by said transmitters of said subassembly, the component or components to be inserted of said file to be inserted, the synchronous insertion step comprising: - initialisation of a time counter from when said at least one piece of reference information is detected, said reference information being of the program information or service information type issued from a signalling associated with said original digital stream; - time stamping of said reference information by said time counter; - insertion of the component or components to be inserted at the moment of correlation of said time-stamped reference information (I 2) and said time stamping cue (I 1) of said description file. - a step of constructing at least one file to be inserted comprising at least one component to be inserted, and at least one insertion description file comprising at least one time stamping cue (I 1) for said component or components to be inserted, said time stamping cue (I 1) defining the instant of insertion and/or the transmission cycle of this component in the original data stream, - a step of synchronously inserting into said original digital stream, by said transmitters of said subassembly, the component or components to be inserted of said file to be inserted, the synchronous insertion step comprising: - initialisation of a time counter from when said at least one piece of reference information is detected, said reference information being of the program information or service information type issued from a signalling associated with said original digital stream; - time stamping of said reference information by said time counter; - insertion of the component or components to be inserted at the moment of correlation of said time-stamped reference information (I 2) and said time stamping cue (I 1) of said description file. - initialisation of a time counter from when said at least one piece of reference information is detected, said reference information being of the program information or service information type issued from a signalling associated with said original digital stream; - time stamping of said reference information by said time counter; - insertion of the component or components to be inserted at the moment of correlation of said time-stamped reference information (I 2) and said time stamping cue (I 1) of said description file.