A communication control device comprising: a control unit configured to control wireless communication by a terminal device capable of performing wireless communication using one primary frequency band and one or more secondary frequency bands when the terminal device is located within a macro cell, wherein, when the terminal device is located within the macro cell and a small cell overlapped by the macro cell partially or entirely, the control unit controls the terminal device in a manner that one of one or more frequency bands for wireless communication in the macro cell is used as the primary frequency band, and each of one or more frequency bands for wireless communication in the small cell is used as the secondary frequency band, wherein a frequency band used in the small cell is higher than a frequency band used in the macro cell; wherein the one primary frequency band and the one or more secondary frequency bands are used in a carrier aggregation wherein the one primary frequency band is one primary component carrier, wherein the one or more secondary frequency bands are one or more secondary component carriers; wherein resource assignment information for each of the one or more small cell frequency bands is transmitted using any one macro cell frequency band among the one or more macro cell frequency bands; wherein, when the resource assignment information is transmitted using the any one macro cell frequency band, small cell band identification information indicating any one frequency band among frequency bands usable in the small cell that serves as a target of the resource assignment information is also transmitted using the any one macro cell frequency band, and wherein the terminal device is notified that the small cell band identification information is transmitted using the any one macro cell frequency band. a control unit configured to control wireless communication by a terminal device capable of performing wireless communication using one primary frequency band and one or more secondary frequency bands when the terminal device is located within a macro cell, wherein, when the terminal device is located within the macro cell and a small cell overlapped by the macro cell partially or entirely, the control unit controls the terminal device in a manner that one of one or more frequency bands for wireless communication in the macro cell is used as the primary frequency band, and each of one or more frequency bands for wireless communication in the small cell is used as the secondary frequency band, wherein a frequency band used in the small cell is higher than a frequency band used in the macro cell; wherein the one primary frequency band and the one or more secondary frequency bands are used in a carrier aggregation wherein the one primary frequency band is one primary component carrier, wherein the one or more secondary frequency bands are one or more secondary component carriers; wherein resource assignment information for each of the one or more small cell frequency bands is transmitted using any one macro cell frequency band among the one or more macro cell frequency bands; wherein the one or more secondary frequency bands are one or more secondary component carriers; wherein resource assignment information for each of the one or more small cell frequency bands is transmitted using any one macro cell frequency band among the one or more macro cell frequency bands; wherein, when the resource assignment information is transmitted using the any one macro cell frequency band, small cell band identification information indicating any one frequency band among frequency bands usable in the small cell that serves as a target of the resource assignment information is also transmitted using the any one macro cell frequency band, and wherein the terminal device is notified that the small cell band identification information is transmitted using the any one macro cell frequency band.