A communication apparatus includes a communication unit and a controller. The controller determines, according to a first reference of received signal strength in one communication apparatus which is either an external communication apparatus or the communication apparatus, a transmitted signal strength for a transmission radio wave from the other communication apparatus as a first reference of transmitted signal strength. The controller determines a second reference of transmitted signal strength between the first reference of transmitted signal strength and a maximum strength of transmitted signal strength from the other communication apparatus. When a predetermined condition is satisfied, the controller obtains a received signal strength of the one communication apparatus for the transmission radio wave in the second reference of transmitted signal strength and determines a transmitted signal strength of a transmission radio wave from the other communication apparatus according to the received signal strength.