An image registering method includes extracting a first cross-section image from first volume data about a target object, which is acquired via a first image acquisition modality； displaying the first cross-section image； acquiring second volume data about the target object, the second volume data including a second cross-section image corresponding to the first cross-section image and position information of a probe, via a second image acquisition modality using the probe； and registering the first volume data with the second volume data, based on the first cross-section image, the second cross-section image, and the position information of the probe.
