The present invention provides a mobile phone having a control mechanism for controlling transmission power according to changes in various environmental conditions. A mobile phone for performing transmission at a transmission frequency of an assigned channel, the mobile phone comprising: a temperature detecting unit operable to detect a temperature in the mobile phone; a correction value specifying unit operable to specify a correction value for correcting transmission power, according to the temperature detected by the temperature detecting unit and the transmission frequency; and a control unit operable to control the transmission power based on the correction value specified by the correction value specifying unit.