1. An imaging apparatus comprising: an imaging unit; a first generation unit configured to combine a through-the-lens image captured by the imaging unit and at least one already captured image at a first combination ratio to generate a multiple image combination result image to be displayed as a live view; a second generation unit configured to combine a plurality of images captured in a multiple exposure shooting mode at a combination ratio different from the first combination ratio to generate a multiple image combination result image to be recorded into a recording medium; a display control unit configured to perform control to display the multiple image combination result image generated by the first generation unit on a display unit as the live view that is sequentially updated; and a control unit configured to switch the combination ratio at which the first generation unit combines the through-the-lens image and the at least one already captured image from the first combination ratio to a second combination ratio which is a combination ratio allowing a user to preliminarily check the combination ratio used by the second generation unit, and control the display control unit to display a multiple image combination result image generated at the second combination ratio by the first generation unit on the display unit as the live view, according to a user's operation.