Graph display apparatus, its operation method and non-transitory computer-readable recording medium having stored therein graph display program

A non-transitory recording medium having stored therein a graph display program that causes a computer of a graph display apparatus that displays, on coordinates having a horizontal axis and a vertical axis, one of which is a time axis and the other one is an axis of examination values, line graphs connecting data points representing examination data about a patient by lines in order of time of examination for a plurality of examination items to function as:

• the graph display program executed by a processor of the computer that obtains the number of pieces of examination data having probabilities of presence in a display period of the time axis by comparing a standard examination interval, which is a standard interval at which examination of each of the plurality of examination items is performed, and the display period, and determines, based on whether the obtained number of pieces of examination data is greater than or equal to a threshold, an ordinary display mode or a low visual recognizability display mode, in which visual recognizability is low, as a display mode of a line graph for each of the plurality of examination items;
• and
• the graph display program executed by the processor of the computer that generates the line graphs of examination data for the plurality of examination items according to the display mode that has been determined for each of the plurality of examination items, and displays the line graphs on the coordinates.