A radio apparatus in which voice frames can be used for data transmission, which prevents abnormal sound and noise from occurring during fast data transmission. A controller of the radio apparatus determines whether the voice frames are being used for voice signal transmission or data transmission based on a result of identification of a mini-header that is stored in the data frames. The controller causes a voice signal reproduction unit to perform a muting operation when a result of the determination successively indicates that the voice frames are being used for data transmission a predetermined first number of times, and the controller causes the voice signal reproduction unit to cancel the muting operation when the result of the determination successively indicates that the voice frames are being used for voice signal transmission a predetermined second number of times in a situation where the muting operation is being performed.