PURPOSE: To provide an application editing device which complements a function name and an argument name by utilizing definition information when descriptions for calling a function and a procedure are provided in a program by extracting and storing name and type information on a variable defined by a user in the program and name and argument information on the function.

CONSTITUTION: In the application program editing device 101, a program definition extraction part 103 which extracts variable and function information defined by the user in the program, a definition information output part 104 which outputs the definition information to the storage device 110, and a program input support part 102 which complements the function name and argument name by utilizing the definition information are provided, and, the definition information is utilized to retrieve the names of the function and argument and the type of the variable with key words, thereby selecting complementation candidates for the function and function argument.