PURPOSE: To provide the printer device and its data managing method which can efficiently compress data on a memory.
CONSTITUTION: The printer device, which executes a printing process by switching applications according to a print command from an external equipment, stores plural application programs in a ROM 213 and arranges data used by corresponding applications in a RAM 213 successively according to the attributes of the data. Then it is decided whether or not the application indicated by the print command is currently executed; when the application is not being executed, the data in the work area corresponding to an application that is being executed at this time are compressed, and the process is moved to the application in instructed with the print command among the stored application programs to perform a printing process.
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