A printer for printing on a long sheet includes a print data divider and a verification processor. The print data divider outputs a plurality of segments of divided print data divided at the boundary of areas from standard print data containing print contents in each of the areas obtained by dividing a standard sheet into a plurality of the areas. The verification processor compares the size of the long sheet with the size of the area included in the standard sheet and rotates the divided print data if it is determined from a result of the comparison that the rotation is necessary.