To perform a guide as for an ETC in a navigation system.

An additional ETC installation information storage part 44 stores ETC installation information expressing the installation of the ETC in association with positional information expressing a current position, when ETC charge related information is processed by an ETC processing part 13. An ETC approach determination part 45 determines the passage of a toll road corresponding to the positional information, based on the current position, even as to the positional information described in the additional ETC installation information storage part 44. The second guide part 43 conducts a guide as to the ETC, based on the ETC installation information stored in the additional ETC installation information storage part 44, even as to the case of passing the toll road installed with the ETC.