1. An image processing device that joins together scenes that are video images, comprising: 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; scene information extraction unit that extracts scene information which is information that indicates the characteristics of the scenes that are to be joined together; transition effects selection unit that selects a specific transition effect from the stored transition effects based on the extracted scene information; and connection unit that joins together the scenes using the selected specific transitioned effects.