Patent ID: 8417217

Claim:
A mobile information terminal, comprising: a computer mounted in said mobile information terminal, the computer including a user presence monitoring unit configured for monitoring a presence of a user, a power monitoring unit configured for monitoring an on/off state of power for driving the mobile information terminal, a radio status monitoring unit configured for monitoring if the terminal is out of range or in range of the service area provided by an outside carrier, and a security managing unit configured for autonomously determining and executing a security method for data held inside in accordance with results of monitoring by said user presence monitoring unit, said power monitoring unit and said radio status monitoring unit, wherein when said security managing unit is notified by said power monitoring unit that the user has provided instructions to turn on the power during an off period of intermittent monitoring by said user monitoring unit and when said user presence monitoring unit judges there is no user present, said security managing unit forcibly maintains the power on while discarding the instructions from the user.