An information processing method for a Machine-to-Machine/Man (M2M) application, a Common Services Entity (CSE) and an Application Entity (AE) are provided. An information processing method for an M2M application applied to a first CSE may include that: a resource creation request sent by an AE is received; whether the resource creation request contains an AE Identifier (ID) of the AE or not is judged; when the resource creation request contains the AE ID of the AE, whether a resource requested to be created in the resource creation request has been created or not is judged based on the AE ID; and in a case where the resource requested to be created in the resource creation request has been created, a first response message indicating an operation failure is sent to the AE.