A mobile communication system according to the present invention implements a communication by radio with a station apparatus, and comprises; a mobile communication radio unit receiving an annunciation data which contains an emergency broadcast notification data for announcing an emergency broadcast from a broadcast station and a receiving condition data needed for receiving the emergency broadcast from the broadcast station; a broadcast receiver for receiving a broadcast wave from the broadcast station; and a controller supplies a power source automatically to the broadcast receiver and also set up the receiving condition data to the broadcast receiver when the emergency broadcast notification data received by the mobile communication radio unit is effective.