To attain a speech of high quality by reducing noise.

This telephone equipment is provided with a timer B1067 in the control part 106 on the side of a slave set to measure the intensity of a receiving electric field (noise level) concerning a receiving channel on the side of a slave set when the timer B is finished in stand-by state, to calculate an average noise level in using environment from the measured noise level. Then the telephone equipment updates a carrier judging level based on the calculating result to make a channel of a relatively low noise level always used. In addition the noise level of all the measured receiving channels are transmitted to a master set to allow the master set to select a channel of a low noise level to be used for transmission.