1. A distributed control network system, comprising: a control client connected to a first communication network by means of a first communication protocol; a plurality of event-driven type distributed control microcomputers connected to a second communication network by means of a second communication protocol for executing programs written in a language different from the program language used by said control client; and a local control server connected to said first communication network by means of said first communication protocol, for controlling said distributed control microcomputers by means of said second communication protocol via said second communication network, said event-driven type executing programs written in the language same as the one used by said control client, transforming the processing program downloaded from said control client into a program written in the program language used by said distributed control microcomputers if said downloaded processing program being a program to be processed by said distributed control microcomputers and transmitting the transformed processing program to said distributed control microcomputers.