To realize information transferring between plural servers without any addition of new functions to those servers.

The apparatus for information transferring of inter-server comprises a receiving means receiving a first message corresponding to a request from a first server among plural servers having respectively server functions, a conversion means converting from the received first message to a second message in a form to be transmitted from a client and a transmitting means transmitting the second message to the second server as a client among the plural servers, so that the apparatus processes information transferring between the first server and the second server based on a communication protocol in a server/client system.