To accurately retrieve medical information effective to diagnose a test subject in a short time from various kinds of medical information stored in a medical information server.

When retrieving the desired medical information from the various kinds of medical information previously stored in the medical information server connected via a network or the like in a DICOM format or the like, this medical device retrieves a person's name attribute having a character string equal or similar to a retrieval key having prescribed elements indicating a test subject name of the test subject from person's name attributes comprising a plurality of elements (e.g. Romaji, Kanji and Hiragana) added to each of pieces of the various kinds of medical information, and retrieves the desired medical information based on the obtained person's name attribute.