A DPF controller (21) easily generates a display identifier and a speech identifier for providing an image and a speech required for driving a mobile body such as an automobile, etc. from state information representing the state of each part of the mobile body. In order to generate a layout identifier (MEN) for specifying a layout of an image to be displayed on a liquid crystal display device (11), an element image identifier (SEN) for specifying a display form of an element image in the layout, and a speech identifier of speech data to be output as display identifiers, the DPF controller (21) matches a MEN/SEN determining table (23) that stores an identifier table defining a correspondence relation between state information (D) and a MEN, a correspondence relation between the state information (D) and a SEN, a correspondence relation between the MEN and the SEN, and a correspondence relation between the state information (D) and a speech identifier with the state information (D) collected from ECUs (30, 40, . . . ) in each part of the mobile body.