In a case where a communication apparatus fails in authentication when acquiring communication parameters from another communication apparatus and where it is determined that an authentication request signal received from the other communication apparatus has been transmitted by unicast, the communication apparatus notifies said other communication apparatus of an error. On the other hand, even in a case where the communication apparatus fails in authentication, when it is determined that the authentication request signal received from the other communication apparatus has not been transmitted by unicast, the communication apparatus does not notify said other communication apparatus of an error.