A visualization system creates a first time axis associated with a start time of a first process and a second time axis associated with an end time of the first process or a start time of a second process subsequent to the first process such that a perpendicular line to the first time axis extends from a time point on the first time axis and intersects the second time axis at a time point thereon, the time point on the second time axis being after the lapse of a time period since the time point on the first time axis, the time period being determined from a planned value of a processing period of the first process or a planned value of the start time of the second process. The visualization system disposes the time axes associated with respective processes and a line segment, and displays them on a display apparatus.