A transmission unit of a radio apparatus generates a packet including: a header part containing identifier data identifying at least a transmission destination radio station and a transmission source radio station; and a data part in which an audio frame and a data frame, each having a predetermined length, are consecutively arranged one after another. When communication is performed in a fast data mode in which data for data communication to be transmitted, instead of a digital audio signal, is inserted in the audio frame, the transmission unit generates, according to an instruction from the controller, a packet in which data for data communication is inserted in the audio frame and the data frame, and the transmission unit converts the packet into a radio signal and transmits the radio signal.