An intermediate processing method of a strip-like, extrusion-molded resin sheet for manufacturing a plurality of intermediate resin sheets, each of which is to be subjected to a heat press processing, comprising the steps of:
- virtually segmenting the strip-like resin sheet into a plurality of individual areas, each of which is associated with a corresponding sheet of the plurality of intermediate resin sheets;
- virtually segmenting each individual area of the plurality of individual areas, which have been virtually segmented, into a plurality of segmented areas;
- acquiring shrinkage rate related information related to a shrinkage rate of each segmented area of the plurality of segmented areas of each individual area;
- calculating corrected intermediate processing conditions for each individual area based on the shrinkage rate of each segmented area;
- and
- implementing an intermediate processing of each individual area of each segmented area based on the corresponding corrected intermediate processing conditions, wherein:
- the intermediate processing is performed after extrusion-molding of the strip-like, extrusion-molded resin sheet and before the heat press processing of the plurality of intermediate resin sheets.