Abstract: A management device includes a storage unit and a processor. The processor is configured to store, when configuration information is updated by one client of a plurality of clients, the updated configuration information, generation information on a generation of the updated configuration information, and identification information of the one client in association with one another in the storage unit. The processor is configured to generate, when restoration to a first generation is requested by a first client, new configuration information with reference to information stored in the storage unit. The new configuration information does not include first contents of first updates made by the first client in second generations later than the first generation and includes second contents of second updates made in the second generations by second clients. The processor is configured to perform a configuration of a network device using the new configuration information.