1. A method for deblurring a barcode image inputted through a mobile terminal comprising the steps of: (a) acquiring the mobile terminal's unique n OTFs (optical transfer functions), from 1-st to nth OTFs, which are calculated by varying focal lengths for a subject; (b) if a barcode image is inputted through the mobile terminal, (i) fixing a specific value among NSRs (noise-to-signal ratios) in an available scope as a value to be applied to an error metric of Wiener filtering, (ii) applying n PSFs (point spread functions) calculated from the n OTFs to the error metric of the Wiener filtering by a binary search algorithm and (iii) determining whether the result of the application to the error metric of the Wiener filtering is not exceeding the pre-set threshold or not; and (c) selecting a PSF value and an NSR value as values of Wiener filtering if the result of the application to the error metric of the Wiener filtering is not exceeding the pre-set threshold and then performing the Wiener filtering to the inputted barcode image by using the selected PSF value and the selected NSR value.