1. An apparatus for having a server hold obfuscated data obtained by obfuscating data as a result of converting a character code included in the data, the apparatus comprising: a mapping information storage device for storing mapping information indicating that a second glyph is mapped to the character code, wherein the second glyph is a glyph different from a first glyph identified by the server based on the character code and having a width identical to the first glyph; a receiving hardware device for receiving, from the server, the obfuscated data obtained by obfuscating the data as a result of converting the character code included in the data to a character code to which a glyph identified by the server, based on the character code included in the data, is mapped as the second glyph in the mapping information; an identification hardware device for identifying the glyph mapped as the second glyph in the mapping information to a character code included in the obfuscated data received from the receiving hardware device; and a display for displaying the glyph identified by the identification hardware device.