A map data storage method for acquiring map data content used in a subject vehicle and storing the map data content in a common database by using a controller is provided. This method includes converting a format of the acquired map data content to a predetermined format that can be used in the subject vehicle, storing the map data content converted into the predetermined format in the common database, acquiring update information regarding the map data content stored in the common database, and editing the map data content in the predetermined format stored in the common database on the basis of the acquired update information.