1. A server system comprising at least one server and a management section which acquires management information stored in the server, wherein: each of the at least one server comprises: a management information acquisition section which acquires management information stored in the server itself, communications section which can receive both management information transmission order containing a first ID and management information transmission order containing a second ID, where the first ID is an ID of a given object including a server ID of a given server among server-specific server IDs used to distinguish the at least one server from one another while the second ID is an ID of the given object including a common server ID which indicates a server without distinguishing the at least one server from one another and which is used within the management information acquisition section, the given server being the server itself and the given object being management information to be acquired from the given server, and a first ID conversion section which converts the first ID contained in a management information transmission order received by the communications section into a second ID which represents the same given object as the given object represented by the first ID; the management information acquisition section acquires management information, which is the given object identified by the second ID; the communications section sends the management information acquired by the management information acquisition section to an orderer of the management information; the management section comprises: a first communications section which receives a management information transmission order containing a first ID from an external manager, where the first ID is an ID of a given object including a server ID of a given server out of the at least one server, the given object being management information to be acquired from the given server, a second ID conversion section which converts the first ID contained in a management information transmission order received by the first communications section into a second ID containing the common server ID which is used within the management information acquisition section in the given server and which represents the same given object as the given object represented by the first ID, and a second communications section which sends a management information transmission order containing the second ID obtained by the second ID conversion section to the given server and receives management information returned from the given server; and the first communications section sends the management information received by the second communications section to the manager which is the orderer of the management information.