Provided are a navi systen etc. with which it is possible to effect improvement in precision of roadway traffic information which is generated on the basis of probe information. With a navi client (2) probe information is generated in which is included an identifier which represents a sensing result of whether communication is established with a vehicle mounted apparatus (3) etc. With a server communication device (1) when the probe information is either classified or selected according to identifier differences roadway traffic information is generated on the basis of the classified or selected probe information.
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