Graphic display unit and graphic display method using the same

A graphic display unit comprising:

• a shared memory storing graphic data;
• an accelerator which accesses said shared memory to receive graphic data written into said shared memory, said accelerator provided with a graphic data storage means, operating on a first-in-first-out basis, for storing graphic data and a graphic data extension processing unit that processes graphic data written into said shared memory and writes the processed graphic data into the data graphic storage means, said accelerator being provided with an interrupt processing unit which, upon receiving an interruption command, causes the display of the graphic data written into said graphic data storage means;
• a computer which accesses said shared memory, said computer provided with a transfer flag storage region which stores a transfer flag that indicates whether the graphic data should be written directly into said graphic data storage means or into said shared memory, and a transfer data determination unit which, based on the transfer flag, determines whether the graphic data should be directly written into said graphic data storage means or into said shared memory and based upon the determination writes graphic data that does not need to be extended directly into said graphic data storage means and writes graphic data that does need to be extended into said shared memory, said computer being provided with an interrupt control unit that issues an interruption command for synchronizing the writing of graphic data into said graphic data storage means;
• and
• a display unit which displays the graphic data written into said graphic data storage means.