To execute an efficient parallel schedule even when mutually overlapped image elements exist and to execute a high speed plotting instruction when an instruction sequence is divided into plural subsequences and they are executed in plural plotting instruction operation means.
A management information constitution means 2b giving branches having directions to sub-sequences having order dependency by receiving the sub-sequences divided in a sequence division means 1 and removing the different sub-sequence having order dependency when it exists in the sub-sequence to which the branch is given from the judgment processing of order dependency is provided. A scheduling means 3 executing a processing after the processing of the sub-sequence being a depending destination is waited for when the sub-sequence depends on the sub-sequence executed at a place except for a distribution destination at the time of distributing the sub-sequences to the plotting instruction operation means 16a, 16b... 16n being execution destinations is provided.
FUSE TORU
SAKAMOTO SHOJI
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