1. A communication control method, comprising:receiving, by a user terminal, from a base station in a serving cell of a first Public Land Mobile Network (PLMN), first information including information of available radio resources for directly receiving, by the user terminal, a discovery signal in a frequency of the serving cell;
receiving, by the user terminal, second information transmitted by a System Information Block (SIB) from another base station in another cell having another frequency different from the frequency of the serving cell, wherein the second information indicates available radio resources for directly receiving, by the user terminal, a discovery signal from another user terminal in the other frequency of the other cell of a second PLMN different from the first PLMN;
transmitting, by the user terminal, the second information received from the other base station, to the base station in the serving cell; and
directly receiving, by the user terminal, the discovery signal from the other user terminal existing in the other cell, by using the available radio resources in the second information.