To structure the system at a low cost and to easily revise it being associated with data addition and modification.

A management personal computer 20-1 on a field side 20 stores data from different kind of controllers 30-21 to 20-2n as standardized map files 20-11 excluding restriction conditions of the communication specification, data constitution, etc., of the controllers 20-21 to 20-2n. On a user side 10, software 10-13 on the marker which is installed on a data gathering personal computer 10-1 is actuated and its user function is used to access the standardized map file 20-11 on the field side 20 through a standardized communication driver 10-11 and TCP/IP or a telephone line 30.