A medical image diagnostic apparatus includes: a screen saver shape storing unit that stores shapes of a screen saver for respective execution states of an application a screen saver activation event detecting unit that detects an event serving as an activation condition for the screen saver an application execution state detecting unit that detects an execution state of the application a screen saver screen creating unit that reads a shape of the screen saver corresponding to the execution state of the application from the screen saver shape storing unit and creates screen saver image information and a screen saver managing unit that receives notification indicating that the event serving as the activation condition for the screen saver is detected and requests detection of the execution state of the application and, on the other hand, gives the application execution state information to the screen saver screen creating unit to request creation of the screen saver image information.
