1. An image processing device that joins together scenes that are video images, comprising: a transition effect storage unit that records in advance a plurality of types of transition effects that are used in changing the scenes when joining together the scenes; a scene information extraction unit that extracts scene information which is information that indicates characteristics of the scenes that are to be joined together the scene information extraction unit extracting a state indicator that describes, as scene information, the motion of an object that is judged to be included in a single scene, the object being extracted as an object with movement based on differences between a plurality of frame images that comprise the single scene; a transition effects selection unit that selects a specific transition effect from the stored transition effects based on the extracted scene information; and a connection unit that joins together the scenes using the selected specific transitioned effects, wherein the scene information extraction unit comprises a characteristic indicator calculation unit that detects, as a shift indicator, differences between extracted frame images, that identifies the object by correcting the shift, and that calculates a state indicator indicating the movement of the object.