PURPOSE: To roll channels having each different web height without rearranging rolls by bisecting upper and lower horizontal rolls freely movably in their axial directions respectively and adjusting the distances between respectively bisected horizontal rolls and between vertical rolls in accordance with the cross-sectional dimensions of a steel shape to be rolled.

CONSTITUTION: A steel shape having a web and flanges is finish rolled by an universal mill having upper and lower horizontal rolls and a pair of vertical rolls 11, 12. The upper and lower horizontal rolls are divided respectively into two pairs of horizontal rolls 21, 22, 23, 24 freely movably in their axial directions, and the distances between respective divided horizontal rolls 21, 22, 23, 24 and between the vertical rolls 11, 12 are adjusted respectively in accordance with the cross-sectional dimensions of a steel shape to be rolled, to perfrom finish rolling. Accordingly, innumerable H-beams having each the same flange thickness fF and different web height WF can be manufactured without rearranging the rolls.