A communication device and a communication signal generation method that perform, adaptively, a wired power line communication that is given desired communication characteristics being in such a level as to satisfy user demands is provided. The communication device includes a selection unit a selection unit which selects a mode that prescribes a number of one or more channels prepared in a prescribed frequency band used for a communication to be performed with another communication device via a wired medium and a channel to be used for the communication in the mode; and a signal processing unit which generates communication frames to be used for the communication by performing signal processing on input data according to the selected mode and channel.