A machining program management apparatus is used for managing an alteration made to a machining program stored in a plurality of machine tools. The machining program management apparatus acquires, at predetermined intervals set in advance, a piece of machining program updating information including a last update date and time of the machining program stored in each machine tool, identifies a machining program to which an alteration is made, on the basis of the piece of machining program updating information, creates a piece of information on the alteration, and updates a piece of machining program information corresponding to the machining program to which the alteration is made.