In a sharing display processing system having a plurality of display processing systems each including one or a plurality of display apparatuses, each display processing system arranges display regions corresponding to the respective display apparatuses on a first memory region shared with another display processing system, arranges contents on a second memory region managed by the self system, extracts a part of the second memory region on which the contents are arranged as an extracted region, and arranges the extracted region on the first memory region. Each display apparatus displays the extracted region arranged within the range of the display region corresponding to itself on the first memory region.