A step (S100) of connecting a consumer terminal equipped with a measurement app and a server through a communication network; Guide information of the server by activating the immediate measurement app-An extended area based on a window and a window, and an A4 paper that is a comparison target with the window are photographed together, and the coordinates of the vertices of the window in the image data generated by the photographing A step (S200) in which a message prompting to specify three-is transmitted to the consumer terminal; Transmitting the image data obtained from the consumer terminal according to the guidance of the server to the server (S300); Each vertex of A4 paper is extracted from the image data by the server, and the angle value of the window and the angle value of the A4 paper calculated by the trigonometric method using the three coordinates of the vertex of the window and each vertex of the extracted A4 paper, and Calculating the length of the extended area based on the window and the window using an arbitrary division value for the size of the A4 paper, and transmitting the calculated length to a supplier terminal (S400); A method for measuring a smart space based on A4 paper and an ordering method including the step of transmitting product information of any one of a blinder, a roll screen, and a curtain corresponding to the calculated length from a supplier terminal to a consumer terminal (S500) is disclosed. do.
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