To provide a support system for the execution of roofing work, which supports the design and build of a tiled roof meeting a standard prescribed from region to region.

This support system has a data input means, a data storage means and a structural-calculation subsystem, and/or an estimation subsystem, an object management subsystem and a document writing subsystem; a wind force, which factors in wind velocity data set from region to region, is calculated in accordance with a roof structure to be constructed; and structural calculation for each object is performed by using data on a shape, working dimensions, a color, characteristics (yield strength and holding power), a cost, a manufacturer, an execution method and the like of each kind of main and subsidiary materials, in order to present the roof structure meeting the standard. In addition, the use of data on calculation results obtained by the calculation allows the creation of a document, a drawing and a table, which are required for the execution of the work for the tiled roof, and object-to-object management.