Information on posture data that can be used for processing on a frame basis can be acquired for moving image data to be captured. For the purpose, in an imaging apparatus including an imaging unit that captures an image by an optical system to generate image data, a posture data generation unit that generates posture data of a casing including the imaging unit at a timing corresponding to the image data, a notification unit that performs notification for correlating the image data with the posture data on the basis of a trigger, and a detector that detects the notification by the notification unit are provided.