1. A calibration method for a printer, comprising: a patch outputting step for effecting print output of patch, from a print apparatus, on the basis of patch data based on a predetermined number of binarizing processing conditions fewer than plural binarizing processing conditions usable for generating data for print output; a first acquiring step for acquiring first print output characteristics information and first calibration information for the predetermined number of binarizing processing conditions on the basis of read result of said patch and the patch data; a measuring step for effecting output of said patch and measurement of said patch on the basis of the patch data based on the predetermined number of binarizing processing condition in said print apparatus at a predetermined timing; a second acquiring step for acquiring second print output characteristics information for the predetermined number of binarizing processing condition on the basis of measured result of said patch and the patch data based on the predetermined number of binarizing processing condition; a generating step for generating correction data for the predetermined number of binarizing processing condition on the basis of the first print output characteristics information and the second print output characteristics information; and a third acquiring step for acquiring second calibration information for the predetermined number of binarizing processing conditions by correcting the first calibration information on the basis of the generated correction data.