Operation terminal and screen image display method for operation terminal

A screen image display method of displaying a screen image on a display unit in an operation terminal for remotely operating an electronic apparatus, comprising:

• a first step of generating a basic screen image drawing command that draws a basic screen image displayed before said operation terminal is operated;
• a second step of generating a drawing command for drawing an operation screen image that is displayed while said operation terminal is operated;
• a third step of creating a bitmapped image of said basic screen image in accordance with said basic screen image drawing command;
• and
• a fourth step of creating a bitmapped image of said operation screen image in accordance with said drawing command for drawing the operation screen image and writing the same over the bitmapped image of said basic screen image.

A screen image display method of displaying a screen image on a display unit in an operation terminal for remotely operating an electronic apparatus, comprising:

• a first step of generating a basic screen image drawing command that draws a basic screen image displayed before said operation terminal is operated;
• a second step of creating a bitmapped image of said basic screen image in accordance with said basic screen image drawing command;
• a third step of creating a bitmapped image of a difference between the bitmapped image of said basic screen image and a bitmapped image of an operation screen image that is displayed while said operation terminal is being operated;
• and
• a fourth step of writing said difference bitmapped image over the bitmapped image of said basic screen image.