1. A data processor in which data processing is managed by an administrator and in which data processing including installation of software by a user is enabled, the data processor comprising: a processing unit to monitor the data processing executed by the user and to generate an execution history of the data processing; and a recording unit to record the execution history of the data processing, wherein the processing unit confirms an operator of the data processor when the data processor is booted, and outputs notification information representing the execution history in association with booting of the data processor by the administrator as the operator.