To provide an agent of a simpler design and a higher working speed which is adaptable to various contexts and also has high reliability.

A communication agent 10 works between a manager 20 and at least a single resource 30 and has a protocol kernel 111 which is automatically generated from a formalized description of the resource 30. The kernel 111 that is once generated includes a communication interface 14 which performs communication with the manager 20 in a compiled form and a model 11 of the resource 30 including the resource instance value. This instance value can be accessed by the manager 20 via the interface 14.