MAP DRAWING DEVICE AND MAP DATA DISPLAY CONTROL METHOD

A map drawing device can reduce the use amount of a video memory and power consumption. The map drawing device comprises an arithmetic processing unit that operates according to a map drawing program and outputs an address of map data to be drawn; an address difference detection circuit that makes comparison of each address of map data output one by one from the arithmetic processing unit and determines whether or not to output a transfer start trigger signal to a data transfer control unit; and a data transfer control unit that directly transfers the map data with the address instructed by the arithmetic processing unit from a map data storage medium to the video memory based on the transfer start trigger signal output from the address difference detection circuit.