1. A medical image processing apparatus, comprising: processing circuitry configured to acquire image data including image data of a blood vessel of a subject; perform analysis related to the blood vessel by using the image data, and specify a region of interest in the blood vessel based on a result of the analysis; and perform fluid analysis on a region other than the region of interest at a first accuracy, and perform the fluid analysis on the region of interest at a second accuracy that is higher than the first accuracy, wherein the processing circuitry is further configured to generate a synthesis model obtained by coupling an analysis model of the region other than the region of interest generated at the first accuracy and an analysis model of the region of interest generated at the second accuracy, and perform the fluid analysis on the entire blood vessel by using the generated synthesis model.