There is provided a blood-flow analysis apparatus for analyzing the time intensity curve for each pixel or region of interest of time-series images collected by photographing a desired region of a sample over time with a medical modality by applying a tracer to the blood of the sample. The analysis apparatus includes a calculation unit for calculating parameters indicative of blood-flow dynamics peculiar to the measured tissue of the sample as ratio to or difference from parameters at a desired reference region on the basis of only the time intensity curve of the measured tissue, and a visual-information presentation unit for visually presenting the calculations by the calculation unit.