Disclosed is a system for transmitting/receiving wireless power, the system includes a wireless power transmitter including an inverter that generates a first current using an input power source, a first resonant circuit to which the first current is applied to transmit a power signal, and a first controller that controls the inverter, and a wireless power receiver including a second resonant circuit that receives the power signal, an impedance varying unit that varies an impedance of the second resonant circuit, and a second controller that controls the impedance varying unit, wherein the first controller controls the inverter to spread a frequency spectrum of the power signal, and the second controller controls the impedance varying unit such that the second resonant circuit resonates with the power signal generated from the first resonant circuit of the wireless power transmitter. Additional various embodiments recognized through the specification are possible.