PURPOSE: To standarize the framework working and guarantee the quality by providing first and second rules on a working table and disposing framework guide pins which are disclosed and undisclosed freely, a supporting lamp for supporting the assembly order and positions of framework materials and reinforcing core materials and sensors for sensing that the framework materials and reinforcing core materials are fixed.

CONSTITUTION: First, all framework guide pins 30 are pushed up and while an indication lamp 25 located in the position of Mark A only is on, a framework material 20a is inserted between a first rule 24a and the framework guide pins 30 along the first rule 24a and fixed thereon. A sensor 26 senses that the framework material 20a is placed in a position of Mark A, and the indication lamp 25 in the position of Mark A is off and the indication lamp 25a in the position of Mark B is on. Similarly, the framework material 20a and the reinforcing core materials 21a and 21b are inserted between the framework guide pins 30a in the alphabetical order according to the indication lamp 25 to be on successively, and the ends of the framework materials 20a and 20b and reinforcing core materials 21a and 21b are butted and bonded together to assemble framework 22. Screw nails or the like are driven therein to complete the framework 22.