1. A medical image diagnostic apparatus comprising: processing circuitry configured to acquire data of a plurality of Fractional Flow Reserve (FFR) distribution maps comprising at least two time phases regarding a coronary artery and data of a plurality of morphological images comprising the at least two time phases, and to convert the plurality of FFR distribution maps into a plurality of corresponding color maps, respectively; and a display configured to display a plurality of superposed images obtained by superposing the plurality of color maps and the plurality of morphological images respectively corresponding in phase, wherein the processing circuitry restricts display targets displayed by the display for the plurality of color maps based on the plurality of FFR distribution maps.