A source device includes: a low-speed data supply section configured to supply, as low-speed data, data generated in synchronization with a low clock signal out of clock signals having different frequencies, the low clock signal having a frequency lower than a predetermined value; a high-speed data supply section configured to supply, as high-speed data, data generated in synchronization with a high clock signal out of the clock signals, the high clock signal having a frequency higher than that of the low clock signal; a dividing section configured to divide the low-speed data into a predetermined number of pieces of data in accordance with a ratio between the frequencies of the high and low clock signals; and a data transmitting section configured to store the high-speed data and the divided pieces of low-speed data in data having a predetermined data size, and to transmit the stored data.