A computer implemented method and system of identifying crosstalk in a circuit provides significant benefits over conventional manual approaches. Since the guiding member guides the medium to the second medium stacking unit in a case that the second medium stacking unit is set in the opened state and guides medium to the first medium stacking unit in a case that the second medium stacking unit is set in the closed state, the medium can be discharged to the second medium stacking unit in a case that large normal curling occurs. The processor means is configured to relate reading signals generated from a user selection of at least one of the icons and received via the communication means with at least one of the retained character strings to thus perform a secure access checking function for enabling or rejecting user access to a desired service.