PURPOSE: To improve processing efficiency by rapidly retrieving the existence of a schedule.

CONSTITUTION: This schedule management system is provided with a schedule information file 13 for allocating and storing a schedule in each record, a daily file 11 for storing unit data daily indicating the existence of the schedule stored in each record in the file 13 in each unit time, a schedule storing means for storing a schedule inputted from a terminal part 3 when the unit data stored in the file 11 indicates no schedule, an idle time retrieving means for retrieving no shedule indicated by the unit data stored in the file 11 when schedule item time retrieval is specified from the terminal part 3, and a schedule forming means for forming a schedule for a prescribed period by reading out records from the file 11 when the formation of the schedule for the prescribed period is specified.