1. A system for composing a pictorial/video image content where FIU (face image which the user designates) is reflected, comprising: a DCU (pictorial/viDeo image Contents where the FIU is reflected) production control module installed in an information processing device having an operation system for storing and managing information related to a source pictorial/video image content, for outputting and operating a production guide window, and for performing an overall control over changing a face of a specific source character appearing in the source pictorial/video image content to an FIU pattern; an REU creating module for converting, under the control of the DCU production control module, a representative expression image of a specific source character appearing in the source pictorial/video image content into one matching with the FIU, to create an REU (Representative Expression image for User design character); an SEU creating module for converting, under the control of the DCU production control module, standard expression images of the source character based on conversion features between a representative expression image of the source character and the REU, to create plural SEUs (Standard Expression images for User design character); an EDU creating module for selectively combining and transforming the SEUs, under the DCU production control module, based on conversion features exhibiting when a proximate expression image that is most proximate to each reproduced expression pictorial/video image of the source character among standard expression images of the source character is converted into each reproduced expression image, to create an EDU (Expression pictorial/viDeo image for User design character); and a DCU creating module for creating, under the control of the DCU production control module, a DCU having a face image of the source character being newly replaced into the FIU pattern by combining the EDU with a background of the source pictorial/video image content.