an example of a receiving device a receiver 10 includes a radio frequency rf unit 11 a fast fourier transform fft unit 12 a channel estimation unit 13 and a power measuring unit 14 in the receiver 10 the rf unit 11 a d converts a d stands for analog digital a signal received by a receiving antenna which is not shown from an analog signal to a digital signal the fft unit 12 transforms the digital signal into a datum of frequency components by way of a fourier transform the channel estimation unit 13 estimates a channel estimation matrix that shows channel status by using a known signal reference signal mapped beforehand in a frequency resource out of the datum of frequency components the power measuring unit 14 measures the power on the basis of the channel estimation matrix fig2 is a block diagram showing a configuration of the power measuring unit 14 the power measuring unit 14 includes a judgment unit 31 a measuring unit 32 an antenna estimation unit 33 and a power calculation unit 34 the judgment unit 31 makes a judgment on whether or not a ratio between the power of a reference signal r 0 and the power of a signal r 1 is greater than a predetermined threshold value the measuring unit 32 measures the power of the reference signal r 0 and the power of a reference.