| 摘要 |
<p>When a drawing command for the screen drawing data created by an application program corresponding to a user input event is transmitted to a client unit (20), if the transmission delay time t obtained by RTT measurement is within a preset threshold value TH, the drawing command is transmitted in real time in an Instantaneous (Eager) Update mode in the order in which the drawing data was created. If the transmission delay time t has exceeded the threshold value TH, an interval corresponding to a drawing update time interval Tn is allowed and the drawing commands during the interval are put together and transmitted in a Non-instantaneous (Lazy) Update mode. In the Non-instantaneous (Lazy) Update mode, transmission priority according to the type of a drawing command (the user's attention) is set.
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