1. A medical imaging apparatus enabling imaging of an arbitrary slice in a three-dimensional space, which comprises: an image acquiring means for acquiring a first image group consisting of one or more two-dimensional images parallel to a first slice plane, which is one of mutually crossing two slice planes, and a second image group consisting of one or more two-dimensional images parallel to a second slice plane, which is the other of the mutually crossing two slice planes, an extracting means of anatomical feature for extracting information on an anatomical feature defined beforehand from a two-dimensional image, a calculating means of recommended slice position for calculating a recommended slice position to be recommended as a slice position, and an information storing means of recommended slice position calculation for storing recommended slice position calculation information necessary for calculating the recommended slice position according to an imaging region, wherein: the extracting means of anatomical feature extracts information on a first anatomical feature from the first image group, and extracts information on a second anatomical feature from the second image group, and the calculating means of recommended slice position calculates the recommended slice position by using the information on the first anatomical feature and the information on the second anatomical feature according to the recommended slice position calculation information.