A basic issue that we need to address here is the definition of the ICT sector/product. Since 1998, the OECD has been developing an ICT sector/product definition and it has been revised twice. The first ICT definition was based on ISIC Rev. 3 in 1998 and it was followed by the revised ICT sector definition based on ISIC Rev. 3.1 in 2002. The last version is the second ICT sector definition based on ISIC Rev. 4. The resultant detailed definition is presented in Fig. 1. Before we conduct the analysis, we need to define the scope of the sector. If we use the latest I-O Table which follows ISIC Rev. 4 definition, then we should use the second ICT sector definition by OECD (2007). Table 1 shows the detailed ICT sector definition based on 4 digits ISIC Rev. 4 definition.