Patent ID: 8793600

Claim:
An image-processing device comprising: a first memory that stores a first file and a second file, the first file including first printing data and first additional information, and the second file including second printing data and second additional information, the first and second additional information comprising the file names of the first and second printing data, respectively; a second memory that stores alternative image data, the alternative image data being predetermined independent of the first and second printing data; a determining unit configured to determine whether or not the first file is a distinguishable file, the distinguishable file being distinguishable from the second file based on a difference between characters of the first additional information and characters of the second additional information being a predetermined ratio or larger; a creating unit configured to create an index sheet having index data based on a determination made by the determining unit, the index data including first thumbnail data corresponding to the first file and second thumbnail data corresponding to the second file, the creating unit inserting into the index sheet the index data with the alternative image data and the first additional information as the first thumbnail data upon the determining unit determining that the first file is the distinguishable file, the creating unit inserting into the index sheet the index data with the first additional information and image data that is obtained by expanding the first file as the first thumbnail data upon the determining unit determining that the first file is not the distinguishable file; and an outputting unit that outputs the index image sheet having the index.