It is formed, on a display, a first display region in which at least one of measurement signals related to biological information of a subject is displayed in real time. It is formed, on the display, a second display region at a position where is not overlapping with the first display region. A first history display region and a second history display region are displayed in the second display region. The first history display region displays a history related to a first one of the measurement signals, and the second history display region displaying a history related to a second one of the measurement signals.
