A data processing apparatus 100, to reduce power consumption for processing and wirelessly transmitting continuous data to a data reproducing apparatus 200, comprises a first signal processing unit 120 processing data stored in a data storage unit 110, a first wireless communication unit 140 wirelessly transmitting the processed data to the data reproducing apparatus, a signal processing control unit 150 controlling the first signal processing unit 120 so as to work intermittently by processing at a speed faster than real-time processing, a clock/power control unit 160 controlling supplies of clock and power to the first signal processing unit 120 and the signal processing control unit 150 during a non-operating period of the intermittent operation, and a start-up control unit 180 requesting a release of restrictions to the clock/power control unit 160 and a transfer to an operating time period of the intermittent operation to the signal processing control unit 150 based on the amount of data stored in a received data storage unit 230.