To provide a cordless phone that ensures much more enhance speech quality only by an optimum number of channels with noiseless high quality.

At application of power, the presence of carriers is searched as to all speech channels so as to discriminate whether or not be number N of speech channels without carrier reaches a predetermined number. When the number N of channels is less than the prescribed number, the presence of carriers as to all speech channels is searched for. When the number N of channels reaches the prescribed number, the speech channels of the prescribed number are confirmed as valid channels and a channel in use is selected from them.