In order to perform precise time-gain control using a small manual setting device, one of two-dimensional coordinates of a position on a surface of a tablet pointer 215 which an external object touches is defined as a coordinate on a time axis, and the other as a coordinate on a gain axis; and the time gain is controlled based on the two-dimensional coordinates. In order to provide an ultrasonic imaging apparatus that responds to the requirement for both portability and versatility, the ultrasonic imaging apparatus comprises a portable imaging apparatus 100 comprising ultrasonic imaging means, and a support apparatus 500 which comprises supporting means for supporting extension of functions of the imaging apparatus, and which is electrically connected to and mechanically joined to the imaging apparatus so that it can be removably combined with the imaging apparatus.

 
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