A diagnostic support system for diabetes including an input device used for inputting diagnostic data including clinical testing data; a biological model having parameters and which represents a organ function related to diabetes as a numerical model; an predicting means for predicting parameter values suited for a patient based on the diagnostic data and the biological model; a pathological condition analyzing means for analyzing a diabetic pathological condition of a patient based on the parameter values predicted by the predicting means; a diagnostic support information generating means for generating diagnostic support information based on the analyzed pathological condition; and a diagnostic support information outputting means for outputting information obtained by the diagnostic support information generating means. A computer-readable storage medium is also disclosed.