A mobile radio communication method in which a radio resource is shared with a first communication between one of first mobile terminal devices and a radio base station, which is performed by using an infrastructure mode for performing communication controlled based on scheduling by the radio base station, and a second communication between a plurality of second mobile terminal devices, which is performed by using an ad hoc mode for performing communication by autonomous distributed control, the mobile radio communication method including advertising, by the one of the first mobile terminal devices in an area in which the radio base station exists, at a timing specified by the radio base station, a radio resource which is usable for the second communication in the ad hoc mode and is not used for the first communication in the infrastructure mode, to one of the second mobile terminal devices that is present in a range which a radio wave reaches from the one of the first mobile terminal devices and performs the second communication in the ad hoc mode, to thereby control the one of the second mobile terminal devices so as not to use a radio resource for the first communication.