An access point apparatus for executing communication complying with an IEEE 802.11 standard series executes communication with another communication apparatus belonging to a first network constructed by the access point apparatus by using one of a first channel access method using a predetermined primary channel in one link and a second channel access method using not the primary channel but a non-primary channel among a plurality of channels included in the link. The access point apparatus transmits to the other communication apparatus, in a case where a radio frame concerning occupancy of at least one channel including the primary channel is received from another access point apparatus constructing a second network different from the first network, and the at least one channel including the primary channel is occupied in the second network, a notification instructing the second channel access method should be used or transmission of a radio frame is prohibited.