A sound data transmitting apparatus that transmits digital sound data using a first transmission channel for transmitting a transmission signal (STa) of a first form guaranteed to obtain, as reception data, data same as transmission data and a second transmission channel for transmitting a transmission signal (STb) of a second form not guaranteed to obtain, as reception data, data same as transmission data, the sound data transmitting apparatus comprising: a data separating unit (205; 205A) that separates transmission digital sound data into first sound data that should be transmitted through the first transmission channel and second sound data that should be transmitted through the second transmission channel; a first transmission processing unit that processes the first sound data separated by the data separating unit (205; 205A), at least by applying processing for adding data for error correction and digital modulation processing to the first sound data to obtain the transmission signal (STa) of the first form; a second transmission processing unit that processes the second sound data separated by the data separating unit (205; 205A), at least treating the second sound data as straight binary data, wherein there is an ordered relationship between an LSB Least Significant Bit and an MSB Most Significant Bit, and applying analog modulation to the second sound data to obtain the transmission signal (STb) of the second form; a data transmitting unit that transmits, through the first transmission channel, the transmission signal (STb) of the first form obtained by the first transmission processing unit and transmits, through the second transmission channel, the transmission signal (STb) of the second form obtained by the second transmission processing unit; and a data-information supplying unit that supplies, to a reception side, data information for determining whether the transmission digital sound data includes the second sound data besides the first sound data. a data separating unit (205; 205A) that separates transmission digital sound data into first sound data that should be transmitted through the first transmission channel and second sound data that should be transmitted through the second transmission channel; a first transmission processing unit that processes the first sound data separated by the data separating unit (205; 205A), at least by applying processing for adding data for error correction and digital modulation processing to the first sound data to obtain the transmission signal (STa) of the first form; a second transmission processing unit that processes the second sound data separated by the data separating unit (205; 205A), at least treating the second sound data as straight binary data, wherein there is an ordered relationship between an LSB Least Significant Bit and an MSB Most Significant Bit, and applying analog modulation to the second sound data to obtain the transmission signal (STb) of the second form; a data transmitting unit that transmits, through the first transmission channel, the transmission signal (STb) of the first form obtained by the first transmission processing unit and transmits, through the second transmission channel, the transmission signal (STb) of the second form obtained by the second transmission processing unit; and a data-information supplying unit that supplies, to a reception side, data information for determining whether the transmission digital sound data includes the second sound data besides the first sound data.