Data communication apparatus, data communication system, data communication method, data communication program and information recording medium

摘要

when receiving reception error information from at least one of a plurality of other transfer destinations which indicates that data reception has not been performed properly as a result of the data transfer being performed by a multicast communication manner for a plurality of other transfer destinations, data re-transfer to the at least one of other plurality of transfer destinations is performed with one selected from the multicast and unicast communication manners according to the number of the at least one of other plurality of transfer destinations which has transmitted the reception error information.