To provide an information communication system capable of performing communication while keeping a real time property at all the time without providing a dedicated communication line by further improving resistance to a fault.

Routes A and B, not mutually overlapped, are prepared in advance by setting the routing tables of respective routers R1-R5. In a transmission side computer COM 1, data to be transmitted are copied, the address information of a reception side computer COM 2 is added to both these copied data, a communication packet is prepared by adding the address information of the router R1 to one piece of copied data and adding the address information of the router R2 to the other piece of copied data respectively and this communication packet is sent to a network. The reception side computer COM 2 fetches data contained in the first arriving communication packet between the communication packets arriving through the route A and the route B.