To provide a bank account and on-line shopping system in which security is enhanced.

Another time limit bank account is newly opened by transferring an amount within the deposit balance of the existing bank account. The time limit bank account is opened only on specific days of the week or only in a specific time zone in a predetermined opening period, disappears when the predetermined opening period expires and deposit remaining at the time of disappearance is transferred to the existing bank account. The time limit bank account is applicable to an on-line settlement system and the on-line shopping system and withdrawal of money or acceptance of an order of an article are allowed only during opening of the time limit bank account.