An apparatus (101, 107) for controlling tomosynthesis imaging using an imaging device including a sensor in which pixels are two-dimensionally arranged, the apparatus comprising: at least one communication circuit (112, 506); at least one processor; and at least one memory (502, 503, 504) including a program that includes instructions to be executed by the at least one processor to implement processing, the at least one processor configured to: set an imaging condition of tomosynthesis imaging; output a signal, for controlling the sensor, to the imaging device via the at least one communication circuit (112, 506) based on the set imaging condition; cause a display device to display at least one tomographic image including an oblique image based on projection images obtained from the sensor controlled by the signal; designate the displayed oblique image; obtain information of a position and an orientation of the designated oblique image; output the designated oblique image as an image obtained by the tomosynthesis imaging; and output the designated oblique image, via the at least one communication circuit (112, 506), as a DICOM image including information of the set imaging condition and information for identifying the position and the orientation of the oblique image in associated information. at least one communication circuit (112, 506); at least one processor; and at least one memory (502, 503, 504) including a program that includes instructions to be executed by the at least one processor to implement processing, the at least one processor configured to: set an imaging condition of tomosynthesis imaging; output a signal, for controlling the sensor, to the imaging device via the at least one communication circuit (112, 506) based on the set imaging condition; cause a display device to display at least one tomographic image including an oblique image based on projection images obtained from the sensor controlled by the signal; designate the displayed oblique image; obtain information of a position and an orientation of the designated oblique image; output the designated oblique image as an image obtained by the tomosynthesis imaging; and output the designated oblique image, via the at least one communication circuit (112, 506), as a DICOM image including information of the set imaging condition and information for identifying the position and the orientation of the oblique image in associated information. set an imaging condition of tomosynthesis imaging; output a signal, for controlling the sensor, to the imaging device via the at least one communication circuit (112, 506) based on the set imaging condition; cause a display device to display at least one tomographic image including an oblique image based on projection images obtained from the sensor controlled by the signal; designate the displayed oblique image; obtain information of a position and an orientation of the designated oblique image; output the designated oblique image as an image obtained by the tomosynthesis imaging; and output the designated oblique image, via the at least one communication circuit (112, 506), as a DICOM image including information of the set imaging condition and information for identifying the position and the orientation of the oblique image in associated information.