in fig4 a and transactions in section b are the transactions for desalination management referred to as tr csr1 tr csr2 in fig4 b the transactions in section b before their call out is started are connected to a transmitting destination pointer 413 and in the case where a plurality of transactions exist in section b for the service 3 4 the next pointer sections 421 and 431 are used to provide connection thereof a communication with a plurality of transactions in section b is usually referred to as a multi address calling further in the case where services themselves are to be linked for example from service 3 3 to service 3 4 the services are managed such that address of the next tr send is written into the next pointer section 411 a detailed description will now be given with respect to fig4 referring to fig4 tr send is a transaction of service storing single service information in this transaction tr send the next pointer section 411 links and manages tr send a transmitting document pointer section 412 manages the document to be transmitted and a transmitting destination pointer section 413 provides link management of the transactions of the destinations indicated by tr csr1 and tr csr2 further a transmission complete pointer section 414 removes.