Abstract: System and method for processing retail purchases at a point-of-sale POS system, by a user carrying a personal mobile terminal, said mobile terminal having a network data connection and a barcode reader for reading, by the user, of the barcodes of the products to be purchased, said system comprising a computer server for receiving the barcodes read by said mobile terminal through said network data connection; an electronic controller for receiving the barcodes received by said computer server through a suitable data link; a data connection between said controller and said POS; wherein said controller is arranged to send to the POS system through said data connection the received barcodes to be processed by said POS system as a retail purchase by said user.