To solve the problem with the conventional group communication using DCS, in which a partner station cannot be individually specified and the determination for within range/out of range is only a relation to any one of radio stations in a group.

In message communication in which a group mode among radio stations each having a data communication function is set up, each of the radio stations operates as a transmission radio station to transmit group communication implementation information (including its own identification information such as a call sign) and a message in a group communication frequency, while operating as a reception radio station to display on a liquid crystal display device equipped with a touch panel [its own station identification information and message] transmitted by the transmission radio station in new order of receipt time in a list form. Coding transmission data using as a coding key its own identification information of a destination radio station allows the transmission of a confidential form massage or the removal by time management from reception time.