METHOD OF COMMUNICATING MESSAGES IN A DISTRIBUTED PROCESSING SYSTEM

In an information processing system having plural processing units connected through a communication medium, each processing unit operates to receive information to be transmitted from a processing portion operating in the processing unit to the communication medium and a content code predetermined according to the content of the information to be transmitted. Based on the received content code, the processing unit operates to determine an address of the destination processing unit, a sending mode used for transmitting the information, and whether or not the more reliable communication method arranged to establish a connection between the processing units is used for transmitting the information. Then, by using the sending mode and the communication method obtained as the determined result, the information is transmitted to the processing unit having an address obtained as the result determined through the communication medium.