Systems and methods are disclosed for processing information. In one implementation, an image processing apparatus includes an acquisition unit that acquires two or more images to be grouped together. The images include time information as attribute information. The image processing apparatus groups the images based on whether the intervals among times represented by the time information are greater than at least one threshold value. The images are managed in the form of a binary tree structure and handled in single or different groups based on comparing a threshold value with the standard deviations of intervals among the times so as to match a user's subjective intention.