| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a portable terminal device capable of authenticating a user without load applied to the user even during off-line operation.SOLUTION: A microphone, a camera, an environmental information sensor, and a clock for month, date and day provided on a portable terminal device are used even during off-line operation, for measuring environmental information measurement value data, and an environmental information measurement value data table formed by collecting the pieces of environmental information measurement value data is created. Based on the data, an average value and a standard deviation of the environmental information measurement value data for every time are recorded for creating and storing a comparison environmental information data table. By comparing the environmental information measurement value data and the data of the comparison environmental information data table, authentication processing of a user is performed.</p> |
