1. A wireless communication device comprising:a receiver configured to receive a first frame from a first terminal and a second frame from a second terminal; and
controlling circuitry configured to
obtain quality information of a first channel with the first terminal based on the first frame and quality information of a second channel with the second terminal based on the second frame, and
determine a transmission rate applied to the first terminal and a transmission rate applied to the second terminal in spatially multiplexed transmission, based on the quality information of the first channel, the quality information of the second channel and interference amount information being indicative of an amount of interference depending on an execution condition of the spatially multiplexed transmission,
wherein the execution condition of the spatially multiplexed transmission includes a channel aging time after acquisition of the quality information of the first or the second channel, and
the interference amount indicated by the interference amount information takes a larger value as the channel aging time becomes longer.