PURPOSE: To write plural processing object information by one task of a multitask processing.

CONSTITUTION: An information processing system where each of plural processing object information relating to a writing task for plural processing object information is used for a processing by writing the information in each of the processing object information storage areas within a storage part 2 in a multitask processing system is provided with a discrimination means 4 discriminating the classification of the writing task in response to the start of the writing task in the multitask processing system and a writing control means 6 writing each of plural processing object information corresponding to the pertinent classified output in each of the processing object information storage area in the storage part designated by the writing location information of the writing task within the processing of the pertinent signal task, in response to the classified output of the discrimination means 4.