1. A mass analysis data processing method for processing data collected comprising: performing a mass analysis on each of a plurality of micro areas set within a two-dimensional area on a sample, which comprises: a) extracting a mass-to-charge ratio giving a maximum intensity for each of the micro areas, based on mass spectrum data corresponding to the micro area; b) distributing the micro areas into a plurality of clusters based on the mass-to-charge ratio extracted; and c) creating a colored two-dimensional image corresponding to a whole or a part of the two-dimensional area by assigning, for given one or more clusters among the plurality of clusters, a display color to a micro area or micro areas belonging to the clusters, the display color being different for each cluster, and for displaying the colored two-dimensional image.