1. A method for focusing in a device having a camera, the method comprising: acquiring images through the camera; displaying a preview image based on the acquired images and a focus item as a text overlaying the preview image in a preview screen while acquiring images through the camera; identifying a caller-ID in contact information corresponding to the text; obtaining an image of the caller-ID as an image of the focus item from the contact information; focusing a part of an image of the acquired images corresponding to the image of the focus item from the preview image and displaying a focus mark corresponding to the part of the image; and capturing a focused image according to the focus item and based on a user's input, wherein the focus item is an object to be focused on from the preview image while acquiring images through the camera.