Provided is a method of generating electromagnetic waves using software. The method includes setting electromagnetic wave pattern data in consideration of a number of a bus (140, 150) connecting a central processing unit (CPU, 110) with a main memory (130) and transmission characteristics of the bus, storing the electromagnetic wave pattern data in a register of the CPU (110), setting an address in the main memory (130) at which the electromagnetic wave pattern data will be recorded, and transferring the electromagnetic wave pattern data to the set address in the main memory (130) through all the lines of the bus (140, 150). Here, electromagnetic waves corresponding to the electromagnetic wave pattern data are generated while the electromagnetic wave pattern data is transferred to the main memory through the bus.