This schedule management system can flexibly cope with an exceptional change or deletion of a part of a schedule. In registering a routine schedule, a unique number (routine number) is added to a series of such schedules. The schedule so registered is so adapted to be able to change only the content of the schedule without changing the added routine number in changing individual schedule. Therefore, an exceptional schedule the content of which has been changed can be flexibly managed by being deleted/changed in a bundle together with other routine schedule, for example. A routine basic condition such as every other day and every Monday and a routine exceptional condition such as shifting down week end and holiday to next day can be set in the routine pattern.