Abstract: [Problem] To allow a user not familiar with computer programming to carry out programming or maintenance (reuse, updates) [Solution] A computer system which has control objects categorized in accordance with input/output functionality, placement group objects, and a behavior management model for integrating them in terms of functionality, and is configured from a behavior control system and a behavior management model editing system, wherein the control objects have input/output ports and are categorized, the categories can have inheritance relationship, the placement group objects can have processing sequence transition functionality and priority processing request functionality, and wherein on the basis of information on a response to a system and on timing thereof, control objects associated by using such functionalities are dynamically managed and allow an object to be placed, to be also dynamically placed.