To rapidly acquire information about consumption power of a program.

A calculation unit 1a calculates an index showing possibility of improving power consumption quantity, as compared to the case of executing statistical analysis on functions described in a given program and independently executing the functions described in the program, in the case of executing the functions in given combination, and prepares a table 1b1 in which the index is associated with the combination of functions. A storage unit 1b stores the table 1b1. A retrieval unit 1c retrieves, among source codes included in a program 3 being a design object, source codes including the combination of functions included in the table 1b1 stored in the storage unit 1b. A display unit 1d displays source codes 3a and 3b acquired by retrieval of the retrieval unit 1c in a mode of being discriminable from other source codes.