1. A mass analysis data processing method for processing collected data comprising: a) performing a mass analysis on each of a plurality of micro areas set within a two-dimensional area on a sample to obtain mass spectrum data for each micro area; b) extracting a maximum intensity and a mass-to-charge ratio giving the maximum intensity for each micro area, based on the mass spectrum data corresponding to the micro area; c) extracting a largest value of the maximum intensities of the micro areas obtained in step b), determining a color scale for displaying the intensity based on the largest value, assigning a color to each micro area according to the color scale, the color corresponding to the maximum intensity obtained for each micro area in step b), and creating and displaying a colored two-dimensional image of the maximum intensity for each micro area corresponding to a portion or entirety of the two-dimensional area; and d) creating a maximum-intensity spectrum based on the mass spectrum data corresponding to the micro area showing a relationship between the maximum intensity obtained for each micro area in the step b) and the mass-to-charge ratio giving the maximum intensity, and displaying the maximum-intensity spectrum in conjunction with the colored two-dimensional image, wherein in the maximum-intensity spectrum, each peak of the maximum intensity at each micro area with the same mass-to-charge ratio is superimposed such that a resulting superimposed peak is segmented with colors according to the color scale.