Abstract: In a switch provided on a network for transferring data, a switch unit includes a scheduler for setting a switch core and an input port unit includes a data allotting unit for allotting transfer data on a priority basis, buffers provided corresponding to the priorities for temporarily storing and outputting the allotted transfer data, a request aggregating unit for aggregating connection requests related to transfer data which are allotted on a priority basis, allotting the connection requests in accordance with the priorities which are taken into consideration in processing by the scheduler and outputting the obtained requests, and a data aggregating unit for aggregating transfer data output from the buffers and transmitting the aggregated data to the switch core.