A method and apparatus are provided for synchronizing between rendering of a multimedia stream by a rendering device and execution of an operation by a software application by at least one execution device. The method includes in the rendering device: receiving the multimedia stream comprising pieces of additional data synchronized with a multimedia item; detecting, in the multimedia stream, an item of destination information indicating that the pieces of additional data are intended for a distinct execution device; extracting the pieces of additional data; transmitting the pieces of additional data to the execution device; triggering the execution, by a software application, of an operation to process the transmitted additional data; and rendering the multimedia item.