A video server includes a plurality of ports used for inputting and outputting material data items, a storage unit capable of storing group information about grouping of the plurality of ports, and a control unit that receives a command of designating a specific port of the plurality of ports for inputting and outputting one of a plurality of specific material data items and the other of the plurality of specific material data items as a first port, determines one or more other ports belonging to the same group of the first port as one or more second ports on the basis of the group information, and executes the command so as to synchronize the plurality of material data items each other using the first port and the one or more second ports.