Map data delivering device, communication terminal, and map delivering method

Abstract

There is disclosed a map data delivering system for providing consistent road network information from supplement map information and map update information. The map data delivering system includes a navigation terminal and a map distribution server. The map distribution server includes a management data storage unit which stores an update element representing differential update data representing a difference of the map data, and update element management data containing an update element ID for identifying the update element, an update date before the updating of the map data, and a dependent update element ID for storing dependency on the updating of the map data; an update management data selector unit which selects the update element management data having the dependent update element ID among the update element management data having the located area overlapped with the map area of the map distribution request from the navigation terminal and the corresponding update element management data; and a network I/F unit which performs communication with the navigation terminal.