Abstract: A method for providing access for a terminal to content of a website and to a first and second advertising message, comprising: presenting the content and at least the first advertising message to a user by means of the terminal; detecting an action by the user of the terminal, which action relates to one of the first and second advertising messages; stopping the presentation of the second advertising message if the second advertising message has also been presented to the user, and presenting the second advertising message to the user if the second advertising message has not been presented to the user; generating an indication signal which forms an indication of this action; determining, on the basis of this indication signal, an advertisement impact value (AIM), which is a measure of the number of indication signals received compared to the number of first and second advertising messages sent.