1. A medical imaging apparatus comprising: a magnetic resonance imaging (MRI) system that performs MRI on a heart and obtains a plurality of magnetic resonance (MR) images; an output circuitry configured to display, on a first region of a screen, an MR image matrix in which the plurality of MR images are arranged in columns and rows; and an image processor configured to display at least one first indicator which indicates a column of the MR image matrix corresponding to at least one of end diastole and end systole and display at least one second indicator which indicates a row of the MR image matrix corresponding to at least one of an apex and a base of the heart, wherein the columns of the MR image matrix are arranged according to time when MR images included in the columns are captured, and the rows of the MR image matrix are arranged according to a position on a longitudinal axis of the heart, the position corresponding to MR images included in the rows, wherein the output circuitry is configured to display, on a second region of the screen, at least one first cross-sectional image on the longitudinal axis of the heart, wherein the image processor is configured to display marks on the at least one first cross-sectional image displayed on the second region, the marks indicating positions, on the longitudinal axis of the heart, respectively corresponding to the rows of the plurality of MR images included in the MR image matrix, and wherein the output circuitry is configured to reposition the marks, based on a user input for repositioning the marks.