1. An information processing device comprising: an input unit receiving a character input representing one of a plurality of expressions of a keyword; an output unit externally outputting information; and a memory unit storing data, wherein said data contains a plurality of stored keywords, a plurality of contents, each being stored in association with at least one of said plurality of stored keywords, and keyword data indicating each keyword of said plurality of stored keywords as being associated with a plurality of potential character inputs corresponding semantically to the keyword but differing in expression, said information processing device further comprising a processing unit that retrieves, from among said plurality of stored keywords based on said keyword data, a keyword stored in association with the plurality of potential character inputs which plurality includes the character input that was received by said input unit, and causes said output unit to output one of said plurality of contents corresponding to the retrieved keyword.