1. A camera apparatus which comprises an inputting portion and a display capable of displaying an object image imaged by a camera module, comprising: a face detecting portion which detects a plurality of faces for a plurality of person images included in the object image; a face mark displaying portion which displays on the display a face mark for each face detected by the face detecting portion; a target specifying portion which receives a user-specified number, representing a number of the plurality of person images to be included as a zoom processing target, from a user, identifies, as the zoom processing target, a subset of person images out of the plurality of person images that is equal in number to the user-specified number, and, when the identified subset of person images comprises two or more person images that are not adjacent, adds, to the zoom processing target, any of the plurality of person images that are not within the identified subset of person images but which are between the two or more person images within the identified subset of person images that are not adjacent; a composition changing portion which changes a composition by performing a zoom processing on the object image including the zoom processing target; and a composition determining portion which determines whether or not the zoom processing target is centered based on magnitudes of left, right, upper, and lower margins, wherein, before it is determined that the zoom processing target is centered, an operation of an imaging key is disabled, and wherein, as soon as it is determined that the zoom processing target is centered, an operation of the imaging key is permitted.