1. A convention checking apparatus checking whether or not a program conforms to conventions being standards when the program is developed, comprising: a convention storing unit storing program specification information for specifying a convention checking program checking whether or not a developed program conforms to a convention, and application condition information for specifying an application condition of the convention; and a controlling unit executing the convention checking program based on the program specification information and the application condition information, which are stored in said convention storing unit, and checking whether or not the developed program conforms to the convention.