Method, device and system used for processing processed object

The invention discloses a method, device and system used for processing a processed object, which belongs to the field of internet communication. The method comprises the steps that a first terminal sends the user identifier of a first subject and the account identifier of a user account to a third party system; the third party system generates an authorization identifier and creates the corresponding relationship between the authorization identifier and the account information of the user account according to the account identifier and the user identifier, and sends the authorization identifier to the first terminal; the second terminal acquires the authorization identifier from the first terminal, and sends the conversion information of the processed object to be processed and the authorization identifier to the third party system; and the third party system reduces the conversion numerical value from a first numerical value in the user account of the first subject and adds the conversion numerical value to a second numerical value in the user account of a second subject. According to the invention, the security of the personal information and the account information can be improved.