repeatedly explained a first embodiment diagnosed the vehicle breakdown with the server computer which existed remotely the second embodiment supports the vehicle maintenance which the user of the car does oneself this embodiment corresponds again in a first embodiment when maintenance company ordering ahead is not selected 0078 fig8 is a system configuration chart where maintenance manual for the user to recover a pertinent breakdown corresponding to the vehicle breakdown was installed in the memory of car navigation system 109 vehicle maintenance manual 201 is installed maintenance manual display process 200 takes out the repair manual corresponding to the vehicle breakdown when abnormal data reporting process 121 detects the vehicle breakdown and repair method screen 203 is displayed on display 110 in the example of figure the repair method screen 203 is displayed on display 110 in response to the circulating water temperature abnormality report and the procedure by which the maintenance person of the user or maintenance company does the check exchange of the thermometer sensor is shown the processing flow of maintenance manual display process 200 was shown in fig2 at first the repair manual corresponding to the found abnormally is retrieved and acquired from maintenance manual processing 330 and next the method of repairing a pertinent breakdown is displayed on the display processing 331 the user or the maintenance person of maintenance company can support the procedure by which the maintenance and repair of the vehicle is done directly by this embodiment it is necessary to install maintenance manual in car navigation system in the second embodiment therefore the problem that the memory capacity which car navigation system needs grows is considered maintenance manual also achieves the method downloaded from the server computer in the.