Image-displaying device and method for controlling image-displaying device

An image-displaying device comprising:

• an image capturing sensor that starts capturing an image and outputs output data corresponding to the image;
• an image processor that processes the output data and outputs image data corresponding to the image data from the input of the output data;
• a display that displays moving image as a live view display and displays a still image of an object that has been actually captured based on the image data, wherein
• an exposure time of the image capturing sensor in live view capturing for the moving image is shorter than an exposure time of the image capturing sensor in actual image capturing for the still image, and
• the display starts the live view display based on the image data in synchronization with the image capturing sensor so that a total period of the exposure time of the image capturing sensor in live view capturing for the moving image and a processing time in the image processor is less than or equal to a vertical synchronization period.