A data processor includes a flash memory that stores a plurality of types of data therein, a random access memory that stores record data information therein, and a controller that can access the flash memory and the RAM. The record data information indicates a head address in the flash memory and a data length corresponding to latest data of each of the plurality of types of data. The controller reads, from the flash memory, the latest data of a type of a reading target among the plurality of types of data, with reference to the record data information.