摘要：

For each layer, a scaling rate of an object image or a background image belonging to each of the layers is calculated based on a distance from a predetermined reference point in a virtual three-dimensional space to each of the layers. In addition, for each of the layers, a movement velocity of each of the layers when conducting a parallax scrolling is calculated based on a distance from the predetermined reference point in the virtual three-dimensional space to each of the layers. Furthermore, an image in each of the layers is scaled up or down based on the calculated scaling rate, and each of the layers are moved in a predetermined direction at the calculated movement velocity.

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