1. An imaging apparatus comprising: an image sensor; one or more processors; and at least one memory storing a program which, when executed by the one or more processors, causes the imaging apparatus to: generate RAW moving image data representing an undeveloped image which is continuously captured by the image sensor in response to a capturing instruction; apply a first development process to a representative frame image, which is selected according to a preset condition, from among the RAW moving image data, the first development process using a plurality of different development parameters to generate a plurality of pieces of image data from the representative frame image; determine a development parameter corresponding to image data selected by a user from among the plurality of pieces of image data generated by the first development process; and apply a second development process to the RAW moving image data by using the determined development parameter.