Method for indicating power and communication device

The embodiment of the invention is applied to a wireless local area network system supporting an IEEE (Institute of Electrical and Electronic Engineers) 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and then 802.11 series protocols such as 802.11 be next generation, Wi-Fi 8, UHR, Wi-Fi AI and the like, and can also be applied to a UWB-based wireless personal local area network system, a sensing system and the like. The embodiment of the invention provides a method for indicating power and a communication device, in the method, a sending end device generates a first frame comprising N pieces of first information, the N pieces of first information can indicate the maximum sending PSD corresponding to two BSS operation channel bandwidths, different types of receiving end devices can obtain the maximum sending PSD corresponding to the BSS operation channel bandwidths of the receiving end devices, and the maximum sending PSD can indicate the maximum sending PSD corresponding to the B