A mobile radio communication system in which each of a plurality of mobile stations and a base station randomly transmits and receives data to and from each other is disclosed. A radio random access control system in which each mobile station receives all data from the base station, executes an analysis of destination mobile stations of the received data, obtains from the analysis result the number of mobile stations currently transmitting or receiving the data to or from the base station in a radio zone, in which the own station is present, and calculates delay time after a transmission timing collision at the time of the start of transmission of the own mobile station till the next start of transmission according to the obtained number of mobile stations excluding the own station.