INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, INFORMATION PROCESSING PROGRAM, AND INFORMATION PROCESSING SYSTEM

An information processing terminal includes: a trigger point recording unit that acquires a trigger point at which gait authentication of a user for unlocking doors is performed, the trigger point passed through before a point at which unlocking the doors is performed on the vehicle ; a gait authentication unit that performs the gait authentication on a basis of motion information obtained by continuously measuring walking of the user when the trigger point is passed; and an information presentation unit that notifies the user that the gait authentication has failed in a case where the gait authentication has failed.