A management device and management method capable of improving usability of a storage system is proposed. The management device and the management method for managing data migration between volumes in a storage system in which normal volumes to which fixed storage areas are allocated in advance and virtual volumes to which storage areas are dynamically allocated according to use status coexist as types of volumes for reading and writing data is arranged so that information regarding each volume is collected, and based on the collected information, at least a total logical capacity that is a summation of logical capacities determined in advance for the respective volume is separately displayed for normal volumes and virtual volumes.