A main display region 41 in which medical care data on a plurality of items is displayed is provided on a display screen 15. The main display region 41 may be displayed in two display modes of a two-dimensional display mode and a three-dimensional display mode in which a time scale is longer than a time axis of the two-dimensional display mode and a two-dimensional plane on which time series data is displayed is three-dimensionally displayed using the laws of perspective by which a plurality of straight lines parallel to the time axis in the two-dimensional display mode are drawn to be converged toward the past on the time axis.