Transfer treatment manner, in the computer software program null computer system in order to make transfer treatment the transfer treatment

摘要

PROBLEM TO BE SOLVED: To identify bills related to a transfer easily on a seller side even when a purchaser unitarily transfers the total amount of a plurality of bills. SOLUTION: A computer software program for executing given processing about a bill on a computer system has a bill issuing function for issuing a bill with a bill identification number that is a unique number and is an integer of raised two, as a bill issued to a purchaser. The bill identification number is a number unique at least to unpaid bills to the purchaser.