A method of sending advertising messages in connection with a vehicle parking system in which a mobile telephone (1) is used to commence and to terminate the parking of a vehicle and in which a telephone user sends the identity of the vehicle parking zone concerned to a receiving first computer (2) belonging to said parking system, in conjunction with the commencement and the termination of vehicle parking via the mobile telephone (1), wherein the identity of the parking zone and the telephone number of the mobile telephone (1) are detected and stored in the computer. The invention is characterised in that when a user connects himself to the parking system computer (2) by means of the mobile telephone (1) the parking system computer is caused to send the mobile telephone number and the identity of the parking zone in question, or the identity of the geographical area in which the parking zone is located, to a second computer (6) connected to a memory (7) in which the advertising messages are stored; and in that one or more advertising messages pertinent to said geographical area are caused to be sent to the mobile telephone (1) from the second computer (6).