A device management apparatus is connected to a device and an asset management device via a network. The device management apparatus includes a processor that executes steps of: acquiring a device information of the device via the network in accordance with a communication protocol that suits for the device; detecting at least one event concerning installation, movement, addition, change, or disposal with respect to the device based on the acquired information and internal information stored in the device management apparatus; transforming both identification information of the device and device information corresponding to the one of the events detected into data that enables the asset management device to manage the data; and transmitting transformed data to the asset management device via the network.