A mobile communication method comprises a step in which a first radio base station, finds another radio base station provided in a particular user network when provided in the particular user network; a step in which the first radio base station and the other radio base station found thereby constitutes a group; a step in which a number of mobile stations that can be connected to the group at the same time is decided; and a step in which the number of mobile stations connected at the same time to the first radio base station and other radio base station belonging to the group is restricted based on the decided number of mobile stations that can be connected at the same time.