A method for sharing data and synchronizing broadcast data with additional information, the broadcast data and the additional information being provided by at least two distinct sources to a multimedia device. The method comprises steps of: receiving by a data extractor associated to the multimedia device broadcast data from a first source and extracting first metadata from the broadcast data, accessing by the multimedia device to additional information provided by a second source by using the first metadata and obtaining from the additional information second metadata and additional content data related to a content of the broadcast data, merging and synchronizing, by the multimedia device, the second metadata and the additional content data with the content of the broadcast data, and obtaining modified broadcast data.