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 face of a person image included in the object image; a face mark displaying portion which displays on the display a face mark at a portion of a face detected by the face detecting portion; a target specifying portion which specifies one or more person images out of the person images onto each of which the face mark is displayed as a zoom processing target based on an operation of a user for the inputting portion; and a composition changing portion which changes a composition by performing a zoom processing on the object image including the zoom processing target.