PROCESSING DEVICE, PROCESSING METHOD, NOTIFICATION SYSTEM, AND PROGRAM

A processing device includes: a calculation unit that is configured to detect a position of an object that is a possible obstacle to a vehicle; a first detection unit that is configured to detect a direction of a line of sight of a driver of the vehicle; a decision unit that is configured to decide an aspect of an alarm on the basis of the position and the direction of the line of sight of the driver; and a control unit that is configured to control a speaker corresponding to the position such that a sound of the aspect is output.