In a device management device, a storage unit stores device information pieces of devices on a network, an acquisition unit acquires a device information piece of one of the devices via the network, and a detection unit compares the device information piece with each of the device information pieces stored in the storage unit, and detects at least one of installation, movement, addition, change, and disposal events with respect to the one of the devices. A transforming unit transforms both identification information of the one of the devices and device information items corresponding to the detected event into data that enables an asset management device to manage the data. A transmission unit transmits the data to the asset management device via the network.