In a wireless communication system, a mobile station performs communication by means of first and second wireless communication schemes, and a base station communicates with the mobile station. The base station estimates communication loads of the first and second wireless communication schemes on the basis of a number of times communication is performed by an automatic call from the mobile station and a maximum number of times communication is able to be performed by the automatic call. The base station notifies the mobile station of one of the first and second wireless communication schemes having the low communication load estimated, and the mobile station uses the one of the first and second wireless communication schemes notified by the base station in a standby state caused by the automatic call.