The invention relates to a guiding system for wireless terminals. In the system, position-specific information of route points of the route on which a first wireless terminal travels is determined and it is sent to a guiding server. Supplementary data used for guiding the route are stored in the first terminal in response to a request of the user. The supplementary data are associated with the position information, and the guiding server compiles and stores route information comprising position information and supplementary data. The route information is transmitted from the guiding server to at least one wireless terminal in response to the route request. The position of the terminal is determined and the received route information is presented in the terminal so that said supplementary data are presented when the terminal is in places with which the supplementary data are associated.