To provide a boot system for sequentially accessing memories to read data therefrom capable of reducing activation time of the system.

A page access memory (6) has plural pages and is configured to sequentially access to each page and stores an initialization data and a boot code. The boot system includes a page buffer (9) that buffers a page data stored in the page access memory (6) to relay the same to a random access memory (4); and a sequencer (10) that reads out the page data from the page access memory (6) to the page buffer (9), and when the page data includes an initialization data, executes an initialization processing of the system according to the initialization data before the CPU (2) fetches the boot code.