A mobile communication terminal comprising: a first mobile communication unit that performs data communication via a first mobile communication system by a first mobile communication method; a second mobile communication unit that performs voice communication via a second mobile communication system by a second mobile communication method; a terminal-status detecting unit that detects a status of a mobile communication terminal associated with the voice communication; and a communication switching unit that causes the second mobile communication unit to start a process of acquiring (S310, S406) the second mobile communication system to set communication via the second mobile communication system in a voice communication enabled status, when the terminal-status detecting unit detects a predetermined terminal status with the data communication over the first mobile communication system being enabled by the first mobile communication unit; and when the voice communication via the second mobile communication system is started thereafter, the communication switching unit causes the first mobile communication unit to perform a temporary disconnection process on the first mobile communication system, characterized in that when an application that is not associated with the voice communication is activated before the voice communication by the second mobile communication unit is carried out, the communication switching unit causes the second mobile communication unit to cancel a reception standby status of the second mobile communication system, and causes the first mobile communication unit to perform a temporary disconnection cancelling process on the first mobile communication system to set communication via the first mobile communication system in a data communication enabled status. a first mobile communication unit that performs data communication via a first mobile communication system by a first mobile communication method; a second mobile communication unit that performs voice communication via a second mobile communication system by a second mobile communication method; a terminal-status detecting unit that detects a status of a mobile communication terminal associated with the voice communication; and a communication switching unit that causes the second mobile communication unit to start a process of acquiring (S310, S406) the second mobile communication system to set communication via the second mobile communication system in a voice communication enabled status, when the terminal-status detecting unit detects a predetermined terminal status with the data communication over the first mobile communication system being enabled by the first mobile communication unit; and when the voice communication via the second mobile communication system is started thereafter, the communication switching unit causes the first mobile communication unit to perform a temporary disconnection process on the first mobile communication system, characterized in that when an application that is not associated with the voice communication is activated before the voice communication by the second mobile communication unit is carried out, the communication switching unit causes the second mobile communication unit to cancel a reception standby status of the second mobile communication system, and causes the first mobile communication unit to perform a temporary disconnection cancelling process on the first mobile communication system to set communication via the first mobile communication system in a data communication enabled status.