A software creation section (11) creates update data and version up data and supplies them to a reception device (20) from a transmission section (13) and a server (15). The update data contains update information at the time of the version up data application and after. An update information processing section (31) supplies update information for software of a memory (34) to a rewrite processing section (33) while the other update information is held. A data update section (32) extracts update information for the version up data supplied via interfaces (25, 26), from the update information held in the update information processing section (31) so that it is reflected in the version up data to obtain the latest state and then it is supplied to the rewrite processing section (33). The rewrite processing section (33) rewrites the software of the memory (34) by the update information and the version up data supplied. Thus, it is possible to rewrite the software always to the latest state.
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