Abstract: A schedule management system has a dispersive management unit. A data communication unit provides for communicating between a common schedule data storage memory units and for updating the schedule data which is so commonly stored. Data storage is based on the names of the storage unit and the user's, which names are transmitted from the schedule data storage unit. The schedule data storage unit may be updated from the storage unit management table in order to transmit the updated information to the other schedule data storage units. Therefore, the adjustment of the schedule can be effectively realized even among the remote users so that every one will be aware of the update data.