In a shared change set server, a receiving section receives information on an undetermined change set and information on users sharing the undetermined change set from a terminal device used by a developer who has developed the change set. Subsequently, a shared change set management section prepares a shared change set containing the undetermined change set and information on users sharing the undetermined change set, and stores the shared change set in a shared change set storage section. A transmitting section thereafter transmits information on the shared change set to a terminal device used by a developer sharing the shared change set.