A processor for a user terminal having a function of device-to-device "D2D" communication that is direct inter-terminal communication, configured to perform processing of: receiving a system information block "SIB" broadcasted from a base station in a radio resource control "RRC" idle mode of the user terminal; transmitting data to another user terminal through the D2D communication based on the SIB while the user terminal is in the RRC idle mode, the SIB including first resource information and first power information, the first resource information indicating usable radio resources for the D2D communication, the first power information used by the user terminal for controlling transmission power in the D2D communication; determining radio resources used for transmitting the data based on the first resource information; determining transmission power used in transmitting the data based on the first power information; storing second resource information and second power information that are preconfigured, wherein the second resource information and the second power information are used to control the D2D communication when the user terminal is in out of coverage; determining whether the user terminal is in out of coverage; and transmitting data to another user terminal through the D2D communication based on both the second resource information and the second power information while the user terminal exists in the out of coverage, wherein the second resource information indicates usable radio resources for the D2D communication when the user terminal is in out of coverage, and the second power information is used for controlling transmission power in the D2D communication when the user terminal is in out of coverage. receiving a system information block "SIB" broadcasted from a base station in a radio resource control "RRC" idle mode of the user terminal; transmitting data to another user terminal through the D2D communication based on the SIB while the user terminal is in the RRC idle mode, the SIB including first resource information and first power information, the first resource information indicating usable radio resources for the D2D communication, the first power information used by the user terminal for controlling transmission power in the D2D communication; determining radio resources used for transmitting the data based on the first resource information; determining transmission power used in transmitting the data based on the first power information; storing second resource information and second power information that are preconfigured, wherein the second resource information and the second power information are used to control the D2D communication when the user terminal is in out of coverage; determining whether the user terminal is in out of coverage; and transmitting data to another user terminal through the D2D communication based on both the second resource information and the second power information while the user terminal exists in the out of coverage, wherein the second resource information indicates usable radio resources for the D2D communication when the user terminal is in out of coverage, and the second power information is used for controlling transmission power in the D2D communication when the user terminal is in out of coverage.