In order to realize highly efficient spectrum sharing, it is important to accurately recognize the radio environment for the suitable communication parameter setting, and interpolation of the statistical information on the frequency axis can be used. Some papers report that shadowing has high frequency correlated. However, conventional works only present frequency correlation analyses between several distant channels. In this paper, we evaluate frequency correlation of shadowing based on actual measurement using 5 GHz wireless LAN channels for confirming the adaptability of the frequency correlation to wireless environment recognition. In addition, we examine the possibility of interpolation of statistical information on frequency axis using inverse distance weighting (IDW).