A management mediating device includes a management system communication device for making a connection to a management system outside a fire wall from inside the fire wall, and receiving a command from the management system, and a processor for performing a process in accordance with the received command. The management mediating device further includes a management object system communication device for transferring the command to a management object system, a storage for storing a connection schedule of the management system communication device, and an instructing device for, in accordance with the connection schedule, instructing the management system communication device to make a connection to the management system.