A reception method of receiving a multiplexed signal into which a plurality of data series have been multiplexed by superposition coding, and deriving the plurality of data series from the multiplexed signal, the plurality of data series including a first data series in a first layer and a second data series in a second layer, the reception method comprising the steps of: receiving (S101, S601) the multiplexed signal; demapping (S102, S602) the multiplexed signal, with a second modulated symbol stream of the second data series being included in the multiplexed signal as an undetermined signal component, to generate a first bit likelihood stream of the first data series; demapping (S103, S602) the multiplexed signal, with a first modulated symbol stream of the first data series being included in the multiplexed signal as an undetermined signal component, to generate a second bit likelihood stream of the second data series; performing error control decoding (S104, S602) on the first bit likelihood stream to derive the first data series; and performing error control decoding (S105, S602) on the second bit likelihood stream to derive the second data series, wherein in receiving the multiplexed signal, the multiplexed signal received is a signal on which the first modulated symbol stream and the second modulated symbol stream are superposed at a predetermined amplitude ratio, the first modulated symbol stream being generated by mapping a first bit stream of the first data series according to binary phase shift keying, BPSK, the second modulated symbol stream being generated by mapping a second bit stream of the second data series and being subjected to conversion in accordance with the first modulated symbol stream in only a first direction among the first direction and a second direction perpendicular to each other in a complex plane in which the first modulated symbol stream and the second modulated symbol stream are represented. receiving (S101, S601) the multiplexed signal; demapping (S102, S602) the multiplexed signal, with a second modulated symbol stream of the second data series being included in the multiplexed signal as an undetermined signal component, to generate a first bit likelihood stream of the first data series; demapping (S103, S602) the multiplexed signal, with a first modulated symbol stream of the first data series being included in the multiplexed signal as an undetermined signal component, to generate a second bit likelihood stream of the second data series; performing error control decoding (S104, S602) on the first bit likelihood stream to derive the first data series; and performing error control decoding (S105, S602) on the second bit likelihood stream to derive the second data series, wherein in receiving the multiplexed signal, the multiplexed signal received is a signal on which the first modulated symbol stream and the second modulated symbol stream are superposed at a predetermined amplitude ratio, the first modulated symbol stream being generated by mapping a first bit stream of the first data series according to binary phase shift keying, BPSK, the second modulated symbol stream being generated by mapping a second bit stream of the second data series and being subjected to conversion in accordance with the first modulated symbol stream in only a first direction among the first direction and a second direction perpendicular to each other in a complex plane in which the first modulated symbol stream and the second modulated symbol stream are represented.