The present invention enables measuring the size of a displayed object with a measuring tape tool, which is generated when selecting with a mouse, and changing a display according to an accurate scale, in accordance with the size of the object that is inputted by a user, so as to allow arranging in a variety of ways interior design items such as stickers, frames, and furniture in a virtual space according to a precise scale, thereby enabling accurate interior design in a real space and enhancing satisfaction.
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