Abstract: According to the present invention, a production plan forming apparatus is provided with a constitution wherein based on basic data necessary for forming a production plan and state data changing with time stored in a memory unit (11), an event receiving part (2) receives a change of production state as an event, a pseudo event generation part (4) generates a pseudo event (14a) at a time when it should be processed for an event of which times when it occurred and when a production indication is carried out are different, a dispatching part (3) determines a manufacturing apparatus and a production lot in connection with the event from the event (14) or the pseudo event (14a), and a formed production plan is displayed by a display unit (12).