An information management apparatus for managing data includes a rewritable nonvolatile memory, and a memory controller configured to control inputting information into and outputting information from the nonvolatile memory. The memory controller overwrites a data, which includes a first validity check information, a first data body, a second validity check information, a second data body having the same data as the first data body and a third validity check information arranged in this order, in a designated address area in the nonvolatile memory when the memory controller performs a writing control in which the memory controller writes data in the nonvolatile memory.