1. A non-transitory computer-readable recording medium having stored therein a compression program that causes a computer to execute a process comprising: reading a plurality of character strings from a compression target file; examining order information whether there are any concatenated character strings that contain a certain character string in the plurality of character strings with an order of the certain character string, in a compression dictionary, the compression dictionary correlating a plurality of concatenated character strings with a plurality of compression codes respectively, each of the plurality of concatenated character strings include a plurality of character strings, the order information indicating whether there is a specific character string in the compression dictionary with an order of the specific character string; and searching the compression dictionary utilizing the plurality of character strings when the order information indicates that one or more concatenated character strings include the certain character string.
1. A non-transitory computer-readable recording medium having stored therein a compression program that causes a computer to execute a process comprising: reading a plurality of character strings from a compression target file; examining order information whether there are any concatenated character strings that contain a certain character string in the plurality of character strings with an order of the certain character string, in a compression dictionary, the compression dictionary correlating a plurality of concatenated character strings with a plurality of compression codes respectively, each of the plurality of concatenated character strings include a plurality of character strings, the order information indicating whether there is a specific character string in the compression dictionary with an order of the specific character string; and searching the compression dictionary utilizing the plurality of character strings when the order information indicates that one or more concatenated character strings include the certain character string. 2. The non-transitory computer-readable recording medium according to claim 1 , wherein each of character strings included in the concatenated character string is a character string correlated with a compression code by another compression dictionary, and the process includes performing a compression process on one or more character strings of the plurality of character strings based on the other compression dictionary when the order information indicates that one or more concatenated character strings do not include the certain character string.