A device management apparatus connected to one or more devices via a data transmission channel includes an input information holding unit for holding an input information group including one or more pieces of input information, each of which is to be connected to device information of a device; a device search unit for detecting the devices by a search; a device information acquiring unit for acquiring the device information from the devices; a cross-checking unit for cross-checking information items of the input information with those of the device information; and a registering and updating unit for performing data registration/update by, when the cross-checking unit determines that there is a common information item between the input information and the device information, connecting a piece of input information to the device information based on item entries of the common information item, and storing the connected information as registry management information.