An information processing apparatus , comprising: tomogram acquisition means configured to acquire a tomogram of an object which has been captured by using an ultrasonic probe, position and orientation acquisition means configured to acquire first information indicating a position and orientation of the ultrasonic probe; characterised by comprising: reference point position acquisition means configured to acquire second information indicating a three-dimensional position of a reference point in the object based on an instruction from an operator; image generation means configured to specify, on the basis of the first information indicating the position and orientation of the ultrasonic probe and third information indicating a predetermined three-dimensional distance from the reference point corresponding to the second information, places in the tomogram which correspond to a portion indicating the predetermined three-dimensional distance from the reference point, wherein the image generation means is configured to generate a composite image by combining the tomogram with information indicating the specified places; and display control means configured to cause a display unit to display the composite image. tomogram acquisition means configured to acquire a tomogram of an object which has been captured by using an ultrasonic probe, position and orientation acquisition means configured to acquire first information indicating a position and orientation of the ultrasonic probe; characterised by comprising: reference point position acquisition means configured to acquire second information indicating a three-dimensional position of a reference point in the object based on an instruction from an operator; image generation means configured to specify, on the basis of the first information indicating the position and orientation of the ultrasonic probe and third information indicating a predetermined three-dimensional distance from the reference point corresponding to the second information, places in the tomogram which correspond to a portion indicating the predetermined three-dimensional distance from the reference point, wherein the image generation means is configured to generate a composite image by combining the tomogram with information indicating the specified places; and display control means configured to cause a display unit to display the composite image. reference point position acquisition means configured to acquire second information indicating a three-dimensional position of a reference point in the object based on an instruction from an operator; image generation means configured to specify, on the basis of the first information indicating the position and orientation of the ultrasonic probe and third information indicating a predetermined three-dimensional distance from the reference point corresponding to the second information, places in the tomogram which correspond to a portion indicating the predetermined three-dimensional distance from the reference point, wherein the image generation means is configured to generate a composite image by combining the tomogram with information indicating the specified places; and display control means configured to cause a display unit to display the composite image. <EOS>