A communication apparatus compatible with an IEEE 802.11ax standard that enables multi-user communication in which signals for one or more other communication apparatuses are multiplexed and transmitted, the communication apparatus determines, in a case where the multi-user communication is uplink communication, whether an incompatible apparatus exists around the communication apparatus, the incompatible apparatus being compatible with any of standards of an IEEE 802.11 series that precede the IEEE 802.11ax standard and incompatible with the IEEE802.11ax standard, and transmits, in a case where it is determined that the incompatible apparatus exists around the communication apparatus, an MU-RTS (Multi User Request To Send) frame before data communication through the multi-user communication.