Information Processing Device, Program Update System, and Program Update Method

An information processing device that executes a program includes: a storage unit that includes a plurality of regions for storing a rewritable program; a calculation unit that executes a program stored in the storage unit; a start region specification unit that specifies, from the plurality of regions, a start region in which the calculation unit is executing a program; a rule update unit that specifies a rewrite target region in which a program can be rewritten based on information on the specified start region; and a reception selection unit that selectively receives a rewrite program stored in the rewrite target region.