Communications system, retransmission apparatus, retransmission program, computer readable recording medium in which the retransmission program, communication method and retransmission method have been recorded

摘要

An intermediate relay device (210) includes an outgoing route receiver (21 db) that receives a first outgoing message including a list to which an address of a transmitter/receiver that has transmitted the outgoing message and a port number which is used for a communication by a program which transmitted the outgoing message in the transmitter/receiver are added. The intermediate relay device (210) further includes a return route receiver (21rb) that receives the return message to which the list of the outgoing message is added. And The intermediate relay device (210) further includes a return route transmitter (21rf) that transmits the return message based on a predetermined address which corresponds to the transmitter/receiver and the port number which was used for the communication by the program run in the transmitter/receiver, which are included in the list of the received return message.