INFORMATION PROCESSOR AND INFORMATION PROCESSING METHOD

PROBLEM TO BE SOLVED: To prevent infection by a computer virus using buffer overrun from a program having vulnerability. SOLUTION: This information processor has: a writing circuit 20 writing one piece of writing data and already coded data wherein the writing data are coded into a storage device 40 as writing target data on the basis of a data kind of the writing data into the storage device 40; and a reading circuit 30 setting one piece of reading data read from the storage device 40 and already decoded data wherein the reading data are decoded as reading target data on the basis of a data kind of the data read from the storage device 40. COPYRIGHT: (C)2006,JPO&NCIPI