The invention provides a pick-up device and a method for controlling. Images which apply image processing which is arranged by a user and are displayed in an electronic viewfinder and the images whichdo not apply the image processing are switches every time when a prearranged time segment is passed or a user operation is responded in the pick-up device which is used to apply the image processingwhich can be arranged by the user in the images which are shot. The electronic viewfinder is utilized to realize the preview function for the images through comparing the images which are processed and original images, the preview function enables the user to check the results of the image processing in time before the user photographs practically, and thereby the preview function which is easilyused is provided.