The present disclosure relates to an automatic three-dimensional solid modeling method and program based on a two-dimensional drawing, including at least: acquiring a drawing image; generating a figure by extracting line segments in the drawing image; identifying sub-areas within the figure and identifying spatial types of the sub-areas; and generating a three-dimensional space model by applying height information corresponding to the spatial types of the sub-areas. The present disclosure is convenient in that there is no need to visit the real three-dimensional space in order to implement the corresponding space on a computer, and can remarkably reduce the time required to implement the three-dimensional space.