Importance

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Abstract

In the case of delivering first-edition data, a distribution data amount increases, resulting in increases in lengths of download time and update time. In a data allocation system including a vehicle-mounted device coupled to a server via a network, the server creates from a data group held by the in-vehicle device difference data indicating a difference(s) between object data and analogous data obtained by combining together analogous data blocks similar to the object data, and delivers allocation information of the difference data and analogous data to the in-vehicle device. This in-vehicle device prepares analogous data from its owning data group in accordance with the allocation information of the analogous data received, and rebuilds for installation the object data from the prepared analogous data and received difference data.

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First Claim