Two service signals are transmitted from a service server through a first network in such a way that users' terminal devices display personalized service data items. When service signals are filtered, a terminal device extracts common data items accessible for several terminal devices and a parameter type from a service signal identified by a stored identifier. An end address is determined by applying a stored parameter, related to the parameter type, to a pre-recorded or transmitted algorithm. The end address is transmitted, through a second network, to a server which transmits a first personalized file associated with the end address and bearing personalized data items displayed with the common data items in the device.