Patent ID: 8193954

Claim:
A non-transitory computer-readable recording medium storing therein an information processing program causing a computer to execute: storing to a storage medium, a compression symbol map group having a bit string indicating for each character code, presence or absence of the character code in a file group, and a Huffman tree whose leaf corresponding to the character code stores therein a pointer to a compression symbol map of the character code, the Huffman tree converting the character code into a compression symbol of the character code; compressing sequentially and according to the Huffman tree, a character code to be compressed that is described in a file selected from the file group; detecting access to the leaf of the Huffman tree at the compressing; identifying a compression symbol map of the character code to be compressed, among the compression symbol map group by a pointer stored in the accessed leaf; and updating a bit that indicates presence or absence of the character code to be compressed in the compression symbol map identified at the identifying the compression symbol map.