SCREEN DISPLAY CONTROL APPARATUS

PROBLEM TO BE SOLVED: To suppress flickering in a plotting system for asynchronously processing a plurality of plotting requests from clients and displaying them on a screen. SOLUTION: A state management means 104 prohibits a data transfer control means 105 that makes data transfer control, transferring plotting data based on a plotting request outputted from an input means 100(K) (1≤K≤N) to a plotting means 101 from a frame buffer 102, to a display means 103 between a lock request and an unlock request outputted from the input means 100(K) to the state management means 104. Partial display of only a non-prohibited area is enabled and after the unlock request from the input means 100(K), data transfer of only plotting data based on the plotting request from the frame buffer 102 to the display means 103 is permitted, thereby suppressing flickering in screen updating on the display means 103. COPYRIGHT: (C)2006,JPO&NCIPI