To store TS packet in an external memory connected via an external IF unit at the time shift reproduction time, a buffer for storage is provided at a previous stage and a buffer for reproduction is provided at a subsequent stage. When the data storage in the external memory runs out as the time shift reproduction proceeds, a time shift data managing unit executes a temporary time shift by the buffer for storage and the buffer for reproduction capable of reading and writing at a higher speed than the external memory without mediation of the external memory and then the time shift reproduction mode is changed to the general reproduction mode by a demultiplex mode control unit.