Network accessable apparatus, security method therefor and information storage medium thereof

PURPOSE: A device accessible to the network, a security method thereof, and an information storing media are provided to strengthen the security for contents read from the network in respect of the device accessible to the network. CONSTITUTION: A reader(11) reads the contents from a disk(100) installed to the device(1). A presentation engine(12) reads the contents from the network. The presentation engine generates the first reliable context matched with the contents read from the disk through the reader, generates the second reliable context by interpreting/executing the contents reliably requested from the reliable context, and generates non-reliable context by interpreting/executing the contents non-reliably requested from the first reliable context.