Printing method using communication channel and management method for communication channel

A data management method of apparatus receiving print data and performing printing operation on the basis of the received print data, the data management method comprises:

• establishing a websocket channel with a server configured to store print data;
• requesting the print data to the server through the websocket channel;
• acquiring the print data matched to the apparatus from the server through the websocket channel in response to the request;
• and
• closing the websocket channel established with the server irrespective of printing operation when predetermined time period has elapsed after the print data is acquired.

A server apparatus, comprising:

• a communication unit;
• a memory unit;
• and
• a control unit configured to acquire first print data and second print data through the communication unit, transmits the first print data matched to a first apparatus to the first apparatus through a first websocket channel when print data is requested by the first apparatus through the first websocket channel, and transmits the second print data matched to a second apparatus to the second apparatus through a second websocket channel when print data is requested by the second apparatus through the second websocket channel,
• wherein the control unit controls a channel duration time of the websocket channel with an apparatus requesting the print data out of the first apparatus and the second apparatus when the print data is requested from at least one of the first apparatus and the second apparatus.

A data management apparatus, comprising:

• a communication unit;
• a printing unit;
• and
• a control unit configured to establish a websocket channel with a server configured to store print data through the communication unit, request the print data to the server through the websocket channel, and acquire print data matched to an apparatus from the server through the websocket channel in response to the request,
• wherein the control unit closes the websocket channel established with the server irrespective of printing operation when predetermined time period has elapsed after the print data is acquired.