Patent ID: 8649979

Claim:
A branch point diagram display system comprising: a terminal disposed on a movable body for displaying a branch point diagram of a branch point of a road; a delivery server for delivering data to the terminal at a position before the branch point; a branch point identification unit for identifying a plurality of branch points for which a corresponding branch point diagram is displayed; a branch road part store unit disposed in the delivery server for storing a plurality of branch road parts for generating the branch point diagram, wherein a branch road part fully represents a branch point; a delivery schedule making unit disposed in the delivery server for generating a delivery schedule that defines a delivery part as the branch road part delivered to the terminal at a position before the branch point and for generating an erase schedule that defines the delivery part to be erased at an erase time; a delivery load calculation unit disposed in the delivery server for calculating a delivery load of the delivery part to the terminal according to the delivery schedule; a change unit disposed in the delivery server for changing the delivery schedule according to the delivery load calculated by the delivery load calculation unit; a delivery unit disposed in the delivery server for acquiring and delivering the delivery part from the branch road part store unit to the terminal according to the delivery schedule; a branch point diagram making unit for generating the branch point diagram for each of the branch points identified by the branch point identification unit based on the branch road part delivered by the delivery unit for the branch point; and a branch point diagram display unit for displaying the branch point diagram generated by the branch point diagram making unit.