To provide a device, a method; and a program which are capable of further improving decoding accuracy in a case in which multiplexing/multiple-access using non-orthogonal resources is performed.A device includes: a processing unit configured to apply a second constellation corresponding to a symbol position of a first bit string in a first constellation applied to the first bit string, to a second bit string in regard to a plurality of bit strings to be multiplexed for each of transmission signal sequences to be multiplexed in resource blocks for which at least a part of frequency resources or time resources overlap.