Program analysis method and apparatus

This invention is to present specific information necessary for maintenance of programs in an information system. This program analysis method includes: storing an entity that is an information unit as an object of a processing in a program into a relation table in association with an event affecting a processing for the entity; calculating importance degrees of the events by using data stored in the relation table; and identifying an event affecting a processing for a specific entity by using the data stored in the relation table, and calculating an influence degree of the specific entity by using the importance degree of the identified event. Because the user can grasp the influence degree of the entity, it becomes easy to grasp how much the update of the entity affects other portion in the information system.