A plurality of access points for wireless communications and a management apparatus that manages the plurality of access points hold management information that indicates channels used by each of the plurality of access points and an assigning status of bandwidth for each channel. Then, a bandwidth assigning request issued from a wireless station newly connected to a first access point is received via the first access point and a determination is made, based on a bandwidth assigning status of a channel being used by the first access point, as to whether or not bandwidth requested in the bandwidth assigning request is assignable to the channel. When a determination of unassignable is made in the determination, control is conducted to execute exchanging of the channel of the first access point.