19. The non-transitory computer readable recording medium according to claim 17 , wherein said synonym obtaining part defines said single word and another word extracted from said image data as inconsistent spelled words when said synonym corresponding to said single word matches said another word; and said layer creating part embeds said another word within a position on said accompanying layer the same as the display position of said single word identified by said position identifying part, and embeds said single word within a position on said accompanying layer the same as a display position of said another word identified by said position identifying part.
19. The non-transitory computer readable recording medium according to claim 17 , wherein said synonym obtaining part defines said single word and another word extracted from said image data as inconsistent spelled words when said synonym corresponding to said single word matches said another word; and said layer creating part embeds said another word within a position on said accompanying layer the same as the display position of said single word identified by said position identifying part, and embeds said single word within a position on said accompanying layer the same as a display position of said another word identified by said position identifying part. 20. The non-transitory computer readable recording medium according to claim 19 , wherein said layer creating part creates said more than one accompanying layer having a hierarchical structure when multiple other words are defined by said synonym obtaining part as the inconsistent spelled words of said single word, and embeds each of said other words defined as the inconsistent spelled words of said single word within a position on said different accompanying layer the same as the display position of said single word identified by said position identifying part.