a method of acquisition by a mobile terminal situated in proximity to a display panel , of complementary information related to at least one poster present on the display panel , the method including the following steps : acquisition of the identification data making it possible to identify the display panel , transmission of the identification data to a processing service by way of a communication network ; and reception , from the processing service , of the complementary information relating to the poster presented on the display panel identified by the processing service on the basis of the identification data .