1. An image pick-up apparatus having plural shooting modes, comprising: an image pick-up unit for shooting an object to obtain an image; a setting unit for selecting and setting one of the plural shooting modes; a recording unit for recording image files of images obtained in the plural shooting modes, each of the plural shooting modes being associated with one of a first file format and a second file format, wherein the first file format is used for an image file of a single image and the second file format is used for an image file of plural images; and a controlling unit for controlling the image pick-up unit to obtain at least one image in the shooting mode set by the setting unit, and for producing an image file including the at least one obtained image and having one of the first image format and second image format corresponding to the shooting mode set by the setting unit; wherein the second file format is a file format that sets one of plural images obtained by the image pick-up unit as a main image and sets at least one other image of the plural images as a sub-image, and that has a data structure in which the main image and the sub-image are distinguishable, and wherein the plural shooting modes include a plurality of shooting modes which are associated with the second file format, and which have respective image types as the main image.