PROBLEM TO BE SOLVED: To make it possible to suitably deal with traffic which has a strict delay condition by determining a spatial switching schedule for opening/closing respective time-division gates in a time-division spatial switch so that there is only one time slot corresponding to a certain destination at the same time.
SOLUTION: A scheduler 3 determines the switching method of the time slots and informs time-division switches 21, 22,..., 2i of the determined switching method. The switches 21 to 2i practically execute timewise switching (substitution of time slots). Thus a timewisely switched TDM frame is continuously inputted to a time-division spatial switch 5. Since the switch 5 is a bufferless switch, the switch 5 determines a spatial switching schedule so that there is only one time slot corresponding to a certain destination at the same time. Thereby the scheduler 3 executes spatial switching scheduling for opening/closing respective time-division gates in the time-division spatial switch 5.