Abstract: In one aspect, a reception means receives, from a roadside device, first information transmitted from a mobile body by using a first wireless communication. An identification means identifies, based on information of a terminal apparatus to be managed by an information management means, the terminal apparatus being located in the vicinity of the mobile body that has transmitted the first information. A transmission means transmits second information generated based on the first information, to the terminal apparatus identified by the identification means via a second wireless communication.

Abstract: A signal demodulator apparatus comprises: an input terminal (11) for inputting an external signal; a delay line (12) connected to the input terminal, for outputting a first delay signal obtained by delaying the external signal by a predetermined time; a phase corrector (13) responsive to the first delay signal outputted by the delay line, for correcting phase of the first delay signal on the basis of a phase difference detection signal and outputting the first phase-corrected delay signal as a second delay signal; and a phase difference detector (16, 15, 19, 20) for detecting a phase difference between the second delay signal outputted by said phase corrector and the external signal inputted through the input terminal and for outputting the phase difference detection signal to the phase corrector to correct the phase difference to a predetermined value.