1. An automatic analysis device that mixes a sample and a reagent to measure temporal change of a mixed solution, the automatic analysis device comprising: a measurement point data acquisition unit that acquires a plurality of measurement point data from a reaction process of the sample and the reagent; a first storage unit that accumulates test values and parameters of approximate equations for approximating the plurality of measurement point data; a data processing unit that creates a distribution map of reference data corresponding to the parameters or the test values based on predetermined numbers of the parameters or the test values accumulated in the first storage unit; a second storage unit that stores a plurality of regression functions; and an output unit that arranges and presents, on a display screen, a plurality of screens for individually superimposing, on the distribution map, curved lines corresponding to a plurality of regression function candidates obtained by applying the plurality of regression functions, so as to approximate the distribution map of the reference data.