Patent ID: 6970180

Claim:
A control apparatus for controlling a displayed position of a sub-screen displayed together with a main screen on a display screen, comprising: first command means to control said position of said sub-screen in a first direction; second command means to control said position of said sub-screen in a second direction; and processing means for receiving command signals from said first and second command means and for outputting a control signal; sub-screen signal production control means for compressing a sub-screen video signal and for producing a switching signal in response to said control signal output from said processing means; and a change-over switch for switching between a video signal of said main screen and said compressed sub-screen video signal, wherein said change-over switch is controlled by a timing of said switching signal produced by said sub-screen signal production control means to change said displayed position of said sub-screen in response to said first and second command means; wherein said processing means increases at a predetermined moving speed said displayed position of said sub-screen from an initial moving speed when one of said first and second command means is activated continuously; wherein said processing means judges similarity of said command signals when another one of said first and second command means is activated at the state of said predetermined moving speed; and wherein said processing means continues said predetermined increase of moving speed when said similarity is found and returns to said initial moving speed when said similarity is not found.