<;P>;PROBLEM TO BE SOLVED: To effectively interpret composite image data acquired from an MRI apparatus. <;P>;SOLUTION: An enlarged image data generation section 45 generates and displays display enlarged image data A6 of a local region of display composite image data according to a position signal sent when an operator specifies a part intended to enlargedly display on the display composite image data using a mouse 71 in an input section 7 and an enlargement condition of the composite image data previously set by the operator in the input section 7. <;P>;COPYRIGHT: (C)2009,JPO&INPIT