1. A diagnosis image generating apparatus including a plurality of probes, the diagnosis image generating apparatus comprising: at least one element which is included in each of the plurality of probes, transmits a signal, and receives an echo signal; a detecting unit which detects information regarding an object from echo signals received by the plurality of probes; a selecting unit which selects a probe by which receives the echo signal from which information regarding the object is detected from among the plurality of probes; and a diagnosis image generating unit which generates a diagnosis image of the object by using the selected probe.