A satisfactory reproduction is still enabled with recorded MPEG2-TS having a jitter or the like. A recording/reproducing device includes: a reading unit that reads data to which a time stamp is added and for which reference information is multiplexed to permit the acquisition side to reproduce a clock; an output controller outputting data as read-out data at a timing depending on time stamp information; a selection unit changing the operation by the output controller; a time stamp deletion unit removing time stamp information; a separation unit separating the data; a detection unit that determines whether the reference information is unauthorized; and a buffer management unit controlling a starting/halting of reading in accordance with the remaining volume of a buffer for temporarily storing data.