| 摘要 |
PROBLEM TO BE SOLVED: To prevent illegal access through a protocol at a limit level lower than a reference level by limiting the transmission/reception of data due to the protocol at the limit level lower than the reference level. SOLUTION: First of all, a non-volatile memory 4 acquires the previously registered reference level of information processor 1. Next, levels set in respective protocol are acquired, and the reference level registered in the information processor 1 is compared with the levels set in the respective protocols. When the level of any protocol is lower than the reference level in this comparison, the flag of relevant protocol is set to false and the transmission/reception of data due to this protocol is inhibited. Thus, the state of disabling the transmission/reception of data due to the protocol set to the level lower than the reference level registered in the information processor 1 beforehand is provided and illegal data transmission/reception utilizing the protocol at the low level can be prevented. |
