Provided are a method for a terminal executing vehicle-to-everything (V2X) communication to determine transmission power in a wireless communication system and a terminal utilizing the method. The method determines the transmission power necessary for a V2X transmission, and transmits a V2X signal to another terminal at the determined transmission power, wherein the transmission power for the V2X transmission is determined by means of a second parameter aggregation independent of a first parameter aggregation utilized when the terminal is transmitting a signal to a base station.