Patent ID: 7231296

Claim:
A display device comprising: a first arithmetic processing unit; a display unit at which information is displayed as a bitmap; and an interface unit that can be connected with an external information processing apparatus having a second arithmetic processing unit which executes a specific type of processing and a drive device that reads road map data from a CD-ROM or a DVD, wherein: the first arithmetic processing unit controls the display unit so as to display information related to the specific type of processing transmitted from the external information processing apparatus and also executes another type of processing related to the specific type of processing based upon an instruction provided by the external information processing apparatus; the specific type of processing executed at the second arithmetic processing unit includes processing related to road guidance that contains current-position-detection processing with GPS signals and processing for reading the road map data with the drive device; the another type of processing executed at the first arithmetic processing unit uses the road map data read with the drive device in the external information processing apparatus and includes at least either arithmetic processing for displaying a road map at the display unit or arithmetic processing for a route search, and the first arithmetic processing unit achieves a higher processing performance level than the second arithmetic processing unit.