GAME SYSTEM USING NETWORK, SERVER DEVICE APPLIED TO GAME SYSTEM, COMPUTER PROGRAM, AND CONTENT MANAGEMENT METHOD

PROBLEM TO BE SOLVED: To provide a game system in which a server device can properly manage contents change on the basis of content use result information collected from game machines.SOLUTION: A game system 1 comprises a server device 3 and a plurality of game machines 2 which are interconnected via a network 5. The server device 3 can collect content use result information included in a game to be executed in the respective game machines 2. The game system 1 causes the server device 3 to determine whether a use frequency of the content is less than a predetermined level on the basis of the use result information acquired from at least a part of the plurality of game machines 2, and to execute predetermined processing to change contents when it is determined that the use frequency is less than the predetermined level.