To provide a electronic commercial transaction method between an ordering side and an order receiving side through the use of an electric communication network by which a merchandise transaction among the ordering side, the order receiving side and a mediating side is executed through the use of the electric communication network such as the Internet and a computer, the commercial transaction is rapidly, reliably and efficiently executed and also a mistake in the case of ordering is prevented.

When merchandise is ordered, the order receiving side 2 sets the access IDs and passwords of a person in charge of ordering, his or her superior approving person, another order transacting person, a related approver being a third person or a mediator e.g. after negotiations with the ordering side 1, and registers and preserves them. The stream of a job concerning the commercial transaction is previously set and recorded in a server 4 and executed in accordance with it. Especially in the case of ordering, the job stream is executed by the decision of single ordering by the person in charge or by approved ordering after obtaining the approval of the superior approving person or the related approver being a third person. Then a series of transactions such as merchandise manufacture, its delivery, receipt, demanding, money reception are electrically executed by using the Internet and the computer by the routine of the job stream.