Region information processing system

A region information processing system for processing information concerning a plurality of objective regions in a field to produce information concerning at least one synthetic region to be formed by combining by synthesis the information concerning each of the objective regions being provided by external region information source means, the region information processing system comprising:

• (a) subfield designating means for sequentially designating subfields each constituting part of the field, by providing, one at a time, subfield designating data,
• (b) a plurality of surveying means each associated with a corresponding one of the regions and each responsive to the subfield designating data for examining the region information source means to produce local data of the subfield being designated concerning the associated region, the local data including at least region flag data indicating whether or not the subfield is inside the boundary of the associated region, and
• (c) synthesizing means responsive to the local data of the subfield concerning the objective regions for producing local data of the synthetic region including at least region flag data indicating whether or not the subfield being designated is inside the synthetic region, said synthesizing means judging whether or not the local data of the subfield concerning the objective regions satisfy a predetermined condition to determine depending on the result of the judgement, the significance of the region flag data of the synthetic region.