To keep a system in operation by ensuring synchronization between a master apparatus and a slave apparatus even when a failure occurs in the transmission of a Timecode packet.

A slave apparatus 3 includes: a SpaceWire decoder 5 for decoding a Timecode packet periodically output from a main apparatus 2 to generate a first synchronization signal pulse SP and first synchronization signal data SD; a reference timing signal generation section 6 for generating a dummy pulse rising at the same period as the Timecode packet; a synchronization signal pulse complementation section 12 for inputting the first synchronization signal pulse SP and the dummy pulse to output a second synchronization signal pulse SP'; and a synchronization signal data complementation section 11 for inputting the first synchronization signal data SD and an instruction signal from the synchronization signal pulse complementation section 12 to output second synchronization signal data SD'.