The invention relates to a control device, a data processing device and an application method. The data processing device is a server with network-based remote access (iKVM) functions and server management. The server include a system section for performing various server functions, an iKVM controller for controlling remote access, and an BMC for controlling the server management function. The iKVM controller is provided with a management channel feature so that the BMC can share a network interface controller/circuit/chip (NIC) with the iKVM. The BMC is connected to the iKVM controller, and the iKVM controller is connected to an NIC for the iKVM. The NIC for the iKVM is either directly connected to the network or connected to a NIC for the system section which is in turn connected to the network. In the latter case, the NIC for the system has a management channel where the packets from the iKVM are transmitted. As a result, only one network connector is required for the server.