A method and a relevant apparatus for starting a boot program are provided. The method includes: when a boot request is detected, determining whether a first physical block in a NAND flash is a bad block; reading first boot data stored in the first physical block if the first physical block is not a bad block; determining whether the read first boot data has a data error; re-reading the first boot data from a first backup block when the read first boot data has a data error; determining whether the first boot data that is re-read from the first backup block has a data error; when the first boot data that is re-read from the first backup block has no data error, continuing to process other boot data that needs to be read to start the boot program, until start of the boot program is complete.