An information processing apparatus (100) conducts lexical analysis on an interpreter-type source code and compresses the source code, on which the lexical analysis has been conducted, by using an internal-code correspondence table (410) that associates an internal code and a compression code. When an execution command of an interpreter is received for the compressed source code, the information processing apparatus (100) converts the compressed source code into an internal code in accordance with an internal-code correspondence table (410) and sequentially executes processing in accordance with the converted internal code, whereby when an interpreter-type source code is stored in a compressed state, the execution speed of the interpreter for the source code is improved.