Factories (102-104) have host computers (107) for monitoring
industrial equipments (106). Each host computer (107) is connected
to a management host computer (108) on a vendor (101) side through
the internet (105). The host computer (107) on the factory side detects
occurrence of a trouble of the industrial equipment (106) and notifies the
vendor side of status information representing a trouble state. In response to
this, the host computer (108) on the vendor side notifies the factory side
of response information representing a countermeasure against the trouble state.
