Endoscope system

An endoscope system comprising:

• an insertion portion that is inserted into a subject;
• an objective optical window provided on a distal end side of the insertion portion to receive light from the subject;
• an image pickup section that picks up an image of an interior of the subject using the light incident on the objective optical window;
• a position information acquiring section that acquires position information of the objective optical window;
• a storage section that stores a predetermined organ model image in the subject;
• a recording section that records, in the storage section, a subject internal image acquired by the image pickup section and position/direction information acquired by the position information acquiring section in association with each other;
• a determining section that determines whether or not the image pickup section is moving at a predetermined speed or higher based on the position/direction information and determines, when the image pickup section is not moving at the predetermined speed or higher, that the subject internal image is an image that can be pasted onto a model image of the predetermined organ in a state where the position/direction information of the objective optical window and the position/direction information in a coordinate system of the predetermined organ model image are associated with each other;
• and
• an image pasting section that reads the subject internal image determined by the determining section to be the image that can be pasted from the storage section and pastes the subject internal image onto the model image of the predetermined organ based on the position/direction information.