Method for controlling operations of network system

A method of controlling operations of a network system, the network system comprising a server and a plurality of client terminals linked to the server, the method comprising:

• the server establishing a file set;
• each of the client terminals establishing a directory;
• individually setting a first criterion and a second criterion of the each of the client terminals, the first criterion being stored in the each of the client terminals and being configured to set a first file schedule of the each of the client terminals, and the second criterion being stored in the server and being configured to set a second file schedule of the each of the client terminals;
• a first client terminal of the client terminals selectively uploading file(s) from the directory of the first client terminal to the server according to the first file schedule of the first client terminal, such that the server updates file(s) of the file set using the file(s) received from the first client terminal;
• and
• in response to updating of the file(s) of the file set, the server selectively transmitting updated content of the file(s) of the file set to each of rest client terminals other than the first client terminal on the second file schedule of the each of rest client terminals according to the second criterion of the each of rest client terminals, such that the each of the rest client terminals updates the file(s) of the directory of the each of the rest client terminals using the updated content of the file(s) received from the server.