A design support method for support design of a conveying path by simulating a behavior of a sheet-like flexible medium to be conveyed along a conveying path, includes: a conveying condition setting step of setting drive conditions of conveying rollers for conveying the flexible medium; a rotation direction display step of displaying rotation directions of the conveying rollers set with the drive conditions by the conveying condition setting step; a peripheral speed display step of displaying peripheral speeds of the conveying rollers set with the drive conditions by the conveying condition setting step; and a motion calculation step of acquiring time sequentially the behavior of the flexible medium in accordance with the drive conditions of the conveying rollers set by the conveying condition setting step.