A navigation system, portable information processing device and its control program, data server, information processing server, navigation method, traveling route establishing method, information providing method, and area information providing method are disclosed having a portable terminal (10,54,210) to read out code data, indicative of area information of a destination and routed spots, from a print product (112,114). The code data are converted into area information and stored in a storage unit (23,66,72, 123,223,232,323), from which particular area information is retrieved and transmitted to an on-vehicle navigation device (30,58,104,230) by which a traveling route of the vehicle is established on the basis of area information to guide the vehicle to the destination.