Program, method and apparatus for operating objects displayed on a display

A data processing device, comprising:

• a display device for displaying an object in a display region;
• a pointing device for instructing operation of the object;
• and
• a control unit for executing the operation of the object in the display region, based on the instruction from the pointing device,
• wherein the control unit comprises:
• an object management unit for arranging the object in a pre-set virtual space;
• a coordinate conversion unit for arranging a projection surface that is pre-set in the virtual space, computing a position of the object on the projection surface corresponding to a position of the object in the virtual space, and converting the position of the object on the projection surface into a position in the display region of the display device;
• a display unit for displaying the object in the display region;
• and
• an operation unit for operating the object in the display region, based on the instruction from the pointing device.

An object operation method for operating an object displayed in a display region of a display device connected to a computer by a pointing device, comprising causing a computer to execute steps of:

• arranging the object in a pre-set virtual space;
• arranging a projection surface that is pre-set in the virtual space;
• computing the position of the object on the projection surface, corresponding to the position of the object in the virtual space;
• converting the position on the projection surface into a position in the display region of the display device;
• displaying the object in the display area;
• and
• operating the object in the display region, based on an instruction from the pointing device.