A wireless communication device (200-1#2) comprising: a communication unit configured to receive a physical layer, PHY, header including modulation scheme information from a first wireless communication device (200-1#1) belonging to a first wireless communication network different from a second wireless communication network to which the wireless communication device belongs; and a control unit configured to control a transmission power of the wireless communication device on a basis of information obtained in reception of the PHY header, the PHY header including an identifier of the first wireless communication network, transmission power information regarding a transmission power of the first wireless communication device and allowance signal information in which allowance of another signal transmitted from the wireless communication device for signal reception of a frame in a first destination wireless communication device (100-1#1) which is a destination of the frame transmitted from the first wireless communication device subsequent to the PHY header is specified, the allowance signal information including a degree of interference by the other signal to be allowed, wherein the control unit decides the transmission power of the wireless communication device on a basis of the allowance signal information and an attenuation amount of radio waves related to a signal that the wireless communication device is to transmit, the attenuation amount being estimated on a basis of a distance between the wireless communication device and the first destination wireless communication device, the distance being estimated on the basis of the information obtained in the reception of the PHY header. a communication unit configured to receive a physical layer, PHY, header including modulation scheme information from a first wireless communication device (200-1#1) belonging to a first wireless communication network different from a second wireless communication network to which the wireless communication device belongs; and a control unit configured to control a transmission power of the wireless communication device on a basis of information obtained in reception of the PHY header, the PHY header including an identifier of the first wireless communication network, transmission power information regarding a transmission power of the first wireless communication device and allowance signal information in which allowance of another signal transmitted from the wireless communication device for signal reception of a frame in a first destination wireless communication device (100-1#1) which is a destination of the frame transmitted from the first wireless communication device subsequent to the PHY header is specified, the allowance signal information including a degree of interference by the other signal to be allowed, wherein the control unit decides the transmission power of the wireless communication device on a basis of the allowance signal information and an attenuation amount of radio waves related to a signal that the wireless communication device is to transmit, the attenuation amount being estimated on a basis of a distance between the wireless communication device and the first destination wireless communication device, the distance being estimated on the basis of the information obtained in the reception of the PHY header. <EOS>