COMMUNICATION NETWORK SYSTEM, MANAGEMENT APPARATUS, SERVER APPARATUS, WHITELIST UPDATING METHOD AND PROGRAM

In a communication network system (1), each of a plurality of management devices (20) generates an individual whitelist, which is individually generated in each of a plurality of management devices (20), and is related to a communication destination of an IoT device (30A) connected to an own management device, and uploads a generated individual whitelist to a server device (10), the server device collects the plurality of individual whitelists uploaded from each of the plurality of management devices (20), generates an aggregated whitelist that is an aggregated result of the plurality of individual whitelists, and distributes the generated aggregated whitelist to each of the plurality of management devices (20), and each of the plurality of management devices (20) acquires the aggregated whitelist distributed from the server device (10), and updates the individual whitelist generated by an own management device based on the aggregated whitelist.