A signal processing device with high efficiency of teletext information processing is provided. The assignment request mask circuit 12 uses the already-assigned input port and output port information received from the assignment result reception circuit 11, performs the mask process on the connection assignment request received from the external portion, and sends its result to the M\xd7N scheduler circuit 13. The content associated with the user interface component is adjusted automatically to display at least the portion of the viewable area of the encapsulated component within the viewable area of the user interface component. The male connector is movable between an extended and a retracted position, and is biased towards the retracted position.