The invention relates to a method of updating a plurality of vehicles (10) each comprising an embedded server (20) and at least two devices (25A, 25B), embedded server (20) and each of the devices (25A, 25B) storing initial data, each embedded server (20) being connected to the devices (25A, 25B) mounted in the same vehicle (10) by a local area network (R1). The method comprises the steps of: - transfer of modified data, through a radiofrequency communication wide area network (R2), from a ground server (55) to the embedded servers (20), - when the modified data has been stored in each embedded server (20), transmission via the extended network (R2), an update command, and - transmission of the modified data to at least one device (25A, 25B) through the corresponding local network (R1). , the modified data replacing, in said apparatus (25A, 25B), the initial data.
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