This invention provides a voltage-controlled oscillator, comprising a first voltage-controlled oscillator circuit and a second voltage-controlled oscillator circuit. The track has a number of fragments and each fragment has an identifier. The terminal device is provided with a display means for displaying a specified page and a determination request sending means for sending to the server device a telephone number registration determination request including a telephone number designated by a user through thus displayed page. When the conflict is identified, the method further includes suspending the execution of the low priority job, recording a state of the low priority job at a time of the suspension of the execution and executing the high priority job using the resource.