1. A system for guiding capsule medical device, comprising: a capsule medical device that includes therein first and second imaging units that image images in imaging directions different from each other and a permanent magnet; a magnetic guidance device that applies a magnetic field to the permanent magnet to magnetically guide the capsule medical device in a subject; an operation input unit that receives operation information to operate magnetic guidance of the capsule medical device; a control device that controls the magnetic guidance device to magnetically guide the capsule medical device in response to the operation information input through the operation input unit; and an image display device that displays a first in-vivo image of the subject imaged by the first imaging unit and a second in-vivo image of the subject imaged by the second imaging unit, and indicates which of the first and second in-vivo images is an operation target image at the time of the magnetic guidance of the capsule medical device, wherein the image display device indicates the operation target image by adding a frame image to the operation target image out of the first and second in-vivo images, or the image display device indicates the operation target image by enlarging a display size of the operation target image relative to a non-operation target image out of the first and second in-vivo images.