1. A medical image diagnosis assisting apparatus, comprising: a cardiac function analysis unit configured to calculate, with a three-dimensional medical image representing a heart as input, a cardiac function evaluation value representing a cardiac function with respect to each of predetermined portions of the heart; a myocardial infarction analysis unit configured to calculate, with a three-dimensional medical image representing the heart as input, a myocardial infarction rate representing a degree of myocardial infarction with respect to each of predetermined portions of the heart; and a superimposed image output unit configured to output a superimposed image representing the cardiac function evaluation value and the myocardial infarction rate in a superimposing manner such that they are distinguishable from each other in a coordinate system capable of representing each position of the heart in the three-dimensional medical image.