1. A data distribution system, comprising: a subject data distribution device for distributing subject data to be accessed; a display data distribution device for distributing display data that is used for display of contents of the distributed subject data; a data display device for displaying the distributed display data on a display screen having a given size, wherein the display data distribution device comprises: subject data receiving means for receiving the subject data which is distributed by the subject data distribution device, and whose contents are displayed on the data display device; dividing means for dividing the contents of the received subject data into a plurality of divided areas so that each of the divided areas is larger in size than the display screen, wherein at least one of the divided areas extends outside of all sides of the display area; display data producing means for producing the display data that is used for displaying the plurality of divided areas which have been obtained by the division; and display data distributing means for distributing the display data that is to be displayed on the display screen to the data display device, and wherein the data display device comprises: display data receiving means for receiving the display data that has been distributed by the display data distribution device; and data display means for selectively displaying a displayed portion displayed on the displayed screen among the received display data on the display screen.