In a communication environment in which a plurality of virtual port drivers VPD1, VPD2 use a single communication port COM1, a communication control method enables a virtual port driver VPD1 other than the virtual port driver VPD2 that is occupying the communication port COM1 to communicate through the same communication port COM1. The communication control method includes a step of executing a communication process in which a first virtual port driver VPD1 emulates a specific communication port in communication with the device driver DD1 to which the first virtual port driver VPD1 corresponds. At least when a second virtual port driver VPD2 occupies the communication port COM1, the communication control method executes a step of executing a communication process in which the first virtual port driver VPD1 emulates in communication with the second virtual port driver VPD2 the specific device driver DD2 to which the second virtual port driver VPD2 corresponds.