1. An imaging device comprising: imaging means for capturing an image; moving image data generation means for generating moving image data as image data for a moving image from an image captured by the imaging means; still image data generation means for, when the moving image data generation means generates the moving image data, generating still image data as image data for a still image from an image captured by the imaging means; display data generation means for, when the moving image data is generated, generating first display data for displaying an image corresponding to the moving image data and, when the still image data is generated, generating second display data for displaying an image representing generation of the still image data in parallel with generation of the first display data; and display control means for controlling display of an image corresponding to the moving image data based on the first display data, or the still image data based on the second display data, synthesized with data about still image capturing of a still image from an image captured by the imaging means generated using data indicating a photographic condition of the imaging device, in accordance with a comparison between a detected movement amount of an object within an image captured by the imaging means and a threshold value, wherein the display data generation means generates the second display data for displaying a semi-transmissive image having transmittance corresponding to the detected movement amount.