1. A processing apparatus comprising: an execution unit that executes processing on a document; an execution request accept unit that accepts instruction information, the instruction information comprising a first instruction that instructs another processing apparatus to execute a first processing to be performed on the document, a second instruction that instructs the processing apparatus to execute a second processing to be performed on the document after the first processing, and a security instruction that indicates a security processing to be performed on the document; a process instruction unit that performs the second processing indicated by the second instruction in the instruction information; an information leakage preventing process execution unit that determines whether the another processing apparatus performs the security processing on the document after the first processing based on the instruction information and executes, in response to determining that the another processing apparatus does not perform the security processing, the security processing on the document; and a recording unit that records, in response to the processing apparatus performing the security processing on the document, execution information that indicates the processing apparatus performed the security processing on the document in the instruction information.