An information processing device includes a first communication unit configured to communicate with a first terminal device, a second communication unit configured to communicate with a second terminal device, and a controller configured to generate an abnormality detection signal when an abnormality is detected based on vehicle information on a vehicle, and determine a position of a user based on a communication state of the first terminal device and the second terminal device possessed by the user. The controller is configured to cause the first communication unit to transmit the abnormality detection signal to the first terminal device when the controller determines that the position of the user is included in a first region, and cause the second communication unit to transmit the abnormality detection signal to the second terminal device when the controller determines that the position of the user is included in a second region.