Alert system for vehicle to output alert about occupant being left in vehicle

An alert system for a vehicle, the alert system comprising:

• an in-vehicle object detector configured to detect objects in a compartment of the vehicle, the objects including an occupant;
• and
• an alert controller is configured to:
• in response to determining that a driver of the vehicle has left the vehicle, cause the in-vehicle object detector to detect that the occupant is being left in the compartment of the vehicle;
• in response to determining that the occupant is being left in the compartment after the driver has left the vehicle, determine whether the mobile terminal of the driver is left in the compartment;
• in response to determining that the mobile terminal of the driver is left in the compartment, output an alert to one of mobile terminals that belong to persons other than the driver, and
• in response to determining that a response to the alert is received from the one of the mobile terminals, communicate with the one of the mobile terminals and execute rescue control processing for the occupant who is being left in the compartment after the driver has left the vehicle,
• wherein the execute rescue control processing comprising:
• sending information on feasible multiple rescuing options to one of the mobile terminals;
• determining whether an instruction to execute a rescuing option is received from one of the mobile terminals;
• and
• executing the rescuing option specified by one of the mobile terminals.