A program updating apparatus for a radio base station includes a plurality of non-management radio base stations and a management radio base station. Each of the plurality of non-management radio base stations has a first program. The management radio base station stores a second program to which the first program is updated. The management radio base station transmits the second program to at least one of the plurality of non-management radio base stations such that the first program is updated to the second program. The non-management radio base station having the second program, as a first master radio base station, transmits the second program to another of the plurality of non-management radio base stations, as a first slave radio base station, which does not have the second program such that the first program is updated to the second program.