A user apparatus in a radio communication system including a base station and the user apparatus includes: a receiver unit configured to receive, from the base station, first designation information for designating a resource group including a plurality of resources each including a bandwidth of a predetermined number of resource blocks and second designation information for designating allocation resources in the resource group; and a communication unit configured to perform data communication using the allocation resources designated by the second designation information in the resource group designated by the first designation information.