A mobile terminal device includes a self-diagnosis unit that diagnoses a problem in the application, a modifying unit that modifies a start command to start the application in a state in which the self-diagnosis unit is activated, a specification receiving unit that executes the modified start command upon receiving a specification of the application, an operation procedure display unit that displays an operation procedure that a user executes before a start of the application when the modified start command is executed, a memory unit in which log data indicating a result of a user operation on the application is stored by the activated self-diagnosis unit, and a log data transmitting unit that transmits the log data stored in the memory unit through a network to a remote management server that manages the application problem when a completion of the diagnosis by the self-diagnosis unit is detected.