An inter-frequency measurement report method of a user equipment in a wireless communication system including macro and Closed Subscriber Group,CSG, cells, the method comprising: performing measurements for Physical Cell Identifiers,PCIs, used for a macro cell and a CSG cell comprising an accessible CSG cell and a non-accessible CSG cell, when measurement for inter-frequency handover is performed: wherein an accessible CSG cell is a cell with which the user equipment is registered if a PCI of the cell belongs to the PCIs in a range reserved for use by the CSG cells and is contained in a CSG cell list of the user equipment, and in case there is no registered cell at the user equipment, all the CSG cells of which PCIs are in the range reserved for use by the CSG cells are non-accessible cells; determining whether a measurement of at least one cell fulfils an inter-frequency measurement report event; in response to at least one cell fulfilling the inter-frequency measurement report event, identifying a cell type of a best cell having a greatest received signal strength among the at least one cell fulfilling the inter-frequency measurement report event; determining whether the user equipment has information regarding valid PCI ranges for the CSG cells; if the user equipment does not have the information regarding valid PCI ranges for the CSG cells, acquiring a second information on the best cell; and transmitting, if the best cell is a macro cell or an accessible CSG cell, the inter-frequency measurement report to a serving base station, wherein the accessible CSG cell is identified by the acquired second information. performing measurements for Physical Cell Identifiers,PCIs, used for a macro cell and a CSG cell comprising an accessible CSG cell and a non-accessible CSG cell, when measurement for inter-frequency handover is performed: wherein an accessible CSG cell is a cell with which the user equipment is registered if a PCI of the cell belongs to the PCIs in a range reserved for use by the CSG cells and is contained in a CSG cell list of the user equipment, and in case there is no registered cell at the user equipment, all the CSG cells of which PCIs are in the range reserved for use by the CSG cells are non-accessible cells; determining whether a measurement of at least one cell fulfils an inter-frequency measurement report event; in response to at least one cell fulfilling the inter-frequency measurement report event, identifying a cell type of a best cell having a greatest received signal strength among the at least one cell fulfilling the inter-frequency measurement report event; determining whether the user equipment has information regarding valid PCI ranges for the CSG cells; if the user equipment does not have the information regarding valid PCI ranges for the CSG cells, acquiring a second information on the best cell; and wherein an accessible CSG cell is a cell with which the user equipment is registered if a PCI of the cell belongs to the PCIs in a range reserved for use by the CSG cells and is contained in a CSG cell list of the user equipment, and in case there is no registered cell at the user equipment, all the CSG cells of which PCIs are in the range reserved for use by the CSG cells are non-accessible cells; determining whether a measurement of at least one cell fulfils an inter-frequency measurement report event; in response to at least one cell fulfilling the inter-frequency measurement report event, identifying a cell type of a best cell having a greatest received signal strength among the at least one cell fulfilling the inter-frequency measurement report event; determining whether the user equipment has information regarding valid PCI ranges for the CSG cells; if the user equipment does not have the information regarding valid PCI ranges for the CSG cells, acquiring a second information on the best cell; and transmitting, if the best cell is a macro cell or an accessible CSG cell, the inter-frequency measurement report to a serving base station, wherein the accessible CSG cell is identified by the acquired second information.