To provide a communication system in which a terminal with a light workload performs processing of a terminal with a heavy workload by a new standard and new processing.

The communication system that includes a plurality of communication devices that share 3-dimensional information comprises a first communication device 51 including a CPU occupancy determination device part 6 for determining a proportion of the quantity of work that accompanies drawing of 3-dimensional information, to the quantity of work of the CPU, a drawing level determination device part 5 for determining whether or not drawing of the 3-dimensional information is possible based on the result of the determination, and a first interface card part 9 for sending a part of the 3-dimensional information of which drawing has been determined as difficult to a second communication device 52 through a communication network 41, and the second communication device including a second interface card part 18 for receiving a part of the 3-dimensional information of which drawing has been determined as difficult from the first communication device, and a partner area drawing device part 15 for calculating parameters needed for drawing the received part of the information. The parameters calculated by the partner area drawing device part of the second communication device are returned to the first communication device.