1. A simplified editing apparatus for forming composite images, comprising: means for scanning a plurality of original picture images separately mounted on a scanning drum, wherein the original picture images are to be used in forming a composite image; means for recording a composite image on a record sheet mounted on a recording drum; means for digitally storing coordinate data representing locations at which the original picture images are to be recorded in the composite image; means for digitally storing editing data representing editing processes which are to be performed while recording the composite image, wherein the editing processes include bordering, cropping, flat tone masking, and cutting masking; and editing means for controlling the scanning means and the recording means so as to scan the original picture images, record the scanned original picture images on the record sheet in accordance with the stored coordinate data, and perform editing processes in accordance with the stored editing data, thereby forming the composite image; wherein the editing means performs the editing processes of bordering, cropping, flat tone masking, and cutting masking according to a predetermined order of priority.