a method for region analysis of a document image applied to region analysis system of a document image , the method includes the steps of : a ) analyzing a connected component though a reduced documentimage ; b ) classifying the connected component by generating a tree according to analysis result of the connected component ; c ) grouping text components from the classified connected component according to a spatial connection ; and d ) refining a text block by repeating segmentation and merge of the connected component after the grouping .