| 摘要 |
PROBLEM TO BE SOLVED: To properly swing a screen display while suppressing a capacity increase in storage data.SOLUTION: Image data to be used for a screen display being as large as a display area of an image display device is read from an image data memory. A performance image GE1 for performing a back display in a layer LY1, and a performance image GE2 for overlappingly performing a front display in a layer LY2 for displaying the same screen as the back display more preferentially than the back display are created on the basis of the image data. The back display using the performance image GE1 is arranged so as not to be moved with respect to the display area of the image display device, the front display using the performance image GE2 is arranged so as to be displaced between a forward direction side and a reverse direction side in each predetermined period, and swinging display performance for alternately swinging the front display in the predetermined period is performed. |
