Computer system and controlling method thereof

A controlling method of a computer system, the computer system comprising a container and a display unit, the container having an opening communicating with a receiving space, through which a real article is placed entirely within the receiving space and enters the container, the display unit being for displaying a frame, the controlling method comprising the steps of:

• obtaining a first fictitious role corresponding to the real article;
• obtaining a space characteristic of the real article corresponding to the container, wherein the space characteristic includes the three-dimensional orientation of the real article with respect to the container;
• obtaining a first displaying characteristic of the real article corresponding to the frame according to the first fictitious role and the space characteristic;
• displaying a first fictitious object on the frame according to the first displaying characteristic;
• wherein in the step of obtaining the space characteristic, the space characteristic is obtained by detecting the real article by the computer system;
• the space characteristic comprises a spatial position of the real article in the container;
• and
• the step of obtaining the space characteristic comprises:
• providing a plurality of infrared rays;
• and
• obtaining the spatial position of the real article according to blocking conditions of the infrared rays.