Patent ID: 8438402

Claim:
An electronic terminal comprising: a first storage unit for storing therein confidential information to be protected; a plurality of protection measures that are provided along an attack route extending from an external source to the confidential information stored in the first storage unit, and are operable to intercept an access from the external source to the confidential information via the attack route; a plurality of monitoring units operable to monitor for an attack to any of the plurality of protection measures from the external source; a second storage unit for storing therein (i) value information that is attached to the confidential information and expresses a value of the confidential information, and (ii) a plurality of defense level information pieces each attached to one of the plurality of protection measures and expressing a defense level value of a corresponding protection measure against an attack from the external source; and a control unit operable to, when (i) an attack to any of the plurality of protection measures has been detected, and (ii) a sum of defense level values for protection measures that have not been attacked remaining on a partial route of the attack route extending between the attacked protection measure and the confidential information is less than the value expressed by the value information that is attached to the confidential information, update a protection measure that can be updated among the remaining protection measures on the partial route, wherein the update of the protection measure that can be updated among the remaining protection measures on the partial route causes the sum of the defense level values on the partial route to be greater than the value expressed by the value information that is attached to the confidential information.