FORM 2 THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See section 10, Rule 13] WIRELESS COMMUNICATION APPARATUS, ALLOCATED RESOURCE NOTIFYING METHOD AND DATA ALLOCATING METHOD; PANASONIC CORPORATION, A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF JAPAN, WHOSE ADDRESS IS 1006, OAZA KADOMA, KADOMA-SHI, OSAKA 571-8501, JAPAN THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED. DESCRIPTION Technical Field The present invention relates to a radio communication apparatus for reporting a frequency resource allocation arid a method of reporting an allocation resource, and a radio communication apparatus for receiving a notification of an allocated frequency resource and a method of allocating data. Background Art Studies are underway to . apply a non-contiguous band transmission in addition to a contiguous band transmission to an uplink of LTE-Advanced, which is the development product of 3rd Generation Partnership Project Long Term Evolution (3GPP LTE), in order to improve sector throughput. As shown in FIG.1A, the contiguous band transmission is a technique used to allocate a transmission signal of one terminal to the contiguous frequency band. Meanwhile, as shown in FIG.IB, the non-contiguous band transmission is a technique used to allocate a transmission signal of one terminal to non-contiguous frequency bands. Compared to the contiguous band transmission, the non-contiguous band transmission enhances flexibility of allocating the transmission signal of each terminal to the frequency band, and thus may obtain a larger frequency scheduling effect. In LTE-Advanced, limiting the maximum number of clusters (i.e., contiguous band block or a unit) in the non-contiguous bands to two has been studied, in order to decrease the number of signaling bits of frequency resource allocating information that is reported from a base station to a terminal. In the non-contiguous band allocation of LTE-Advanced, allocating a frequency resource to the terminal in a frequency unit referred to as an RB Group (RBG), which includes a plurality of RBs (Resource Blocks: 1RB = 180kHz), has been studied. The technique disclosed in non-patent literature 1 is known as a method of reporting RBG that the base station allocates to the terminal. Non-patent literature 1 discloses that, in order to perforin the non-contiguous band allocation, the base station converts a start RBG index and an end RBG index of each cluster to be allocated to the terminal into notification information r (i.e., combinatorial index) calculated by equation 1 and notifies the terminal of the result. [1] NRb indicates the total number of RBGs, and M indicates the number of clusters. Also, bi indicates the i-th element of an information sequence in which the start and the end RBG indices of the clusters are arranged in order of cluster indices, which includes a start RBG index SI and an end RBG index ei, i. e., an RGB index indicating a start or end position of cluster band, where i={0, 1, ..., 2M-2, 2M-1} holds true as for cluster index i, and is defined as below. bi=Sj/2 (when i is an even number) bi=e(i-1)/2 (when i is an odd number) In other words, bi={b0, bl,t .... b2M-2, b2M-1} = {so, e0, S1, e1, ... SM-1, eM-1} holds true. As shown in equation 2, si and ei which are components of bi are defined in ascending order using different integers as shown in equation 2. According to this definition, the terminal can uniquely derive 2M RBG indices (bj) from the reported notification information r. Si St, e1, ...SM-I, eM-1} output from notification RBG calculating section 107. To be more specific, allocation RBG calculating section 108 calculates an allocation start RBG index in the cluster (i.e., cluster index 0) located in the lowest frequency band by setting allocation start RBG index (s'j) = notification start RBG index (s;)+l, and an allocation end RBG index in the cluster (i.e., cluster index M-l) located in the highest frequency band by setting allocation end RBG index (e'i) = notification end RBG index (ei)-l. The configuration of a base station according to Embodiment 3 of the present invention is the same as the configuration shown in FIG.7 in Embodiment 1 except for functions of notification RBG calculating section 203 and RBG total number setting section 204. RBG total number setting section 204 is the same as RBG total number setting section 106 of the terminal according to Embodiment 3, and therefore a detailed description thereon will be omitted. Based on allocation RBG index information (b'j) output from scheduling section 201, notification RBG calculating section 203 sets notification RBG index information (bj) to be reported to a terminal by calculating a notification start RBG index in the cluster (i.e., cluster index 0) located in the lowest frequency band to be allocation start RBG index (s'j) = notification start RBG index (Si)+1, and a notification end RBG index in the cluster (i.e., cluster index M-l) located in the highest frequency band to be allocation end RBG index (e'j) = notification end RBG index (ej)-l. Accordingly, notification RBG calculating section 203 outputs the notification RBG index information (bi) to notification information generating section 205. Next, the operation in allocation RBG calculating section 108 in the above-mentioned terminal will be described. Hereinafter, an example where the maximum number of clusters M is two will be described. FIG. 14 shows an example operation of frequency resource allocation when notification RBG indices are associated with allocation RBG indices in Embodiment 3 of the present invention. FIG.14 shows a case where notification RBG total number Nrb'=allocation RBG total number Nrb=8 and notification RBG index information bi reported from the base station is set to bj={so, eo, s1, e1} = {l, 3, 7, 8}. [0080] In this case, allocation RBG index information to be actually allocated to the terminal is calculated by notification RBG calculating section 107 as b'i={s'o=so+l, eo'=eo, s'1—s1, e'1=e1-l } = {2, 3, 7, 7}. Accordingly, the shaded RBG indices (#2, #3, and #7) of FIG.14 are the frequency resources to be allocated. The number of signaling bits required for notification information r of Embodiment 3 can be calculated by equation 3, and therefore the same number of signaling bits as the conventional technique can be maintained. Also, contiguous band allocation can be performed as shown in FIG. 15. According to Embodiment 3, it is possible to freely allocate a cluster bandwidth in RBG units including one RBG, by matching the total number of RBGs to be reported and the total number of RBGs to be allocated, and setting the allocation start RBG index to be a notification start RBG index +1 in the cluster located at the lowest frequency band and the allocation end RBG index to be a notification end RBG index -1 in the cluster located at the highest frequency band. In Embodiment 3, there is a limitation that both ends of a system band (e.g., RBG indices 1 and 8 in FIG. 14) cannot be used for allocation, However, as described in Embodiment 2, the both ends of the system band are generally used for transmitting control channel (e.g., PUCCH). Accordingly, such a limitation does not decrease frequency scheduling gain much, even when data channel (e.g., PUSCH) is not allocated to the both ends of the system band. Thus, the increase in the number of signaling bits can be prevented while deterioration in performance is minimized. In addition, the above embodiments have been described using the case of two clusters as an example. However, the present invention is not limited to the present case, and the same can be applied to three clusters or more. Although a case has been described with the above embodiments as an example where the present invention is implemented with hardware, the present invention can be implemented with software in cooperation with hardware. Each function block employed in the description of each of the aforementioned embodiments may typically be implemented as an LSI constituted by an integrated circuit. These may be individual chips or partially or totally contained on a single chip. "LSI" is adopted here but this may also be referred to as "IC," "system LSI," "super LSI," or "ultra LSI," depending on the differing extents of integration, The method of implementing integrated circuitry is not limited to LSI, and implementation by means of dedicated circuitry or a general-purpose processor may also be used. After LSI manufacture, utilization of an Field Programmable Gate Array (FPGA) or a reconfigurable processor where connections and settings of circuit cells in an LSI can be regenerated is also possible. In the event of the introduction of an integrated circuit implementation technology whereby LSI is replaced by a different technology as an advance in or derivation from semiconductor technology, integration of the function blocks may of course be performed using that technology. The application of biotechnology is also possible. Although the present invention has been described above with embodiments using antennas, the present invention is equally applicable to antenna ports. An antenna port refers to a logical antenna comprised of one or a plurality of physical antennas. Thus, an antenna port is not limited to represent one physical antenna, and may include an array antenna formed by a plurality of antennas. For example, 3GPP LTE does not define the number of physical antennas for forming an antenna port, but defines an antenna port as a minimum unit for transmitting different reference signals from a base station. In addition, an antenna port may be defined as a minimum unit to multiply weighting of a precoding vector. The disclosure of Japanese Patent Application No. 2010-140748, filed on June 21, 2010, including the specification, drawings and abstract, is incorporated herein by reference in its entirety. Industrial Applicability A radio communication apparatus, a method of reporting an allocation resource, and a method of allocating data according to the present invention are applicable to, for example, a mobile communication system such as LTE-Advanced. Reference Signs List 101, 208, 210 Antenna 102, 211 Reception section 103, 217 Demodulation section 104 Scheduling information decoding section 105 frequency resource information calculating section 106, 204 RBG total number setting section 107, 203 Notification RBG calculating section 108 Allocation RBG calculating section 109 Coding section 110, 206 Modulation section 111 DFT section 112 Mapping section 113 IFFT section 114 CP adding section 115, 207 Transmission section 201 Scheduling section 202 Frequency resource information generating section 205 Notification information generating section 209 Holding section 212 CP removing section 213 FFT section 214 Demapping section 215 Frequency domain equalizing section 216 IDFT section 218 Decoding section We Claim: Claim 1 A base station apparatus comprising: an information generating section that generates resource allocation information that indicates a plurality of resources to be allocated to a terminal apparatus, in an uplink; and a transmission section that transmits the resource allocation information, wherein the resource allocation information includes indices corresponding to s and e and indicates each resource composed of one or more contiguous RBGs where s represents a start RBG index and e-1 represents an end RBG index. Claim 2 The base station apparatus according to claim 1 wherein, when the start RBG index is equal to the end RBG index, a single RBG is allocated. Claim 3 The base station apparatus according to claim 1 wherein the indices indicating allocation of two resources in the uplink are generated by start RBG index si and end RBG index el of a first resource, start RBG index s2 and end RBG index e2 of a second resource, and the total number of RBG indices N, provided that N represents the total number of RBGs in a system bandwidth in the uplink adding +1. Claim 4 The base station apparatus according to claim 3 wherein the indices indicating the allocation of the two resources in the uplink are generated based on the following formula: [1] in which M represents the number of resources allocated in the uplink and is 2. Claim 5 A terminal apparatus comprising: a reception section that receives resource allocation information that indicates a plurality of resources allocated by a base station apparatus, in an uplink; and a transmission section that transmits data using the plurality of resources in the uplink based on the resource allocation information, wherein the resource allocation information includes indices corresponding to s and e and indicates each resource composed of one or more contiguous RBGs where s represents a start RBG index and e-1 represents an end RBG index. Claim 6 The terminal apparatus according to claim 5 wherein, when the start RBG index s is equal to the end RBG index e-1, a single RBG is allocated. Claim 7 The terminal apparatus according to claim 5, wherein the indices indicating allocation of two resources in the uplink are generated by start RBG index si and end RBG index el of a first resource, start RBG index s2 and end RBG index e2 of a second resource, and the total number of RBG indices N, provided that N represents the total number of RBGs in a system bandwidth in the uplink adding +1. Claim 8 The terminal apparatus according to claim 7, wherein the indices indicating the allocation of the two resources in the uplink are generated based on the following formula: [2] in which M represents the number of resources allocated in the uplink and is 2. Claim 9 A method of radio transmission, the method comprising the steps of: generating resource allocation information that indicates a plurality of resources to be allocated to a terminal apparatus in an uplink; and transmitting the resource allocation information, wherein the resource allocation information includes indices corresponding to s and e and indicates each resource composed of one or more contiguous RBGs where s represents a start RBG index and e-1 represents an end RBG index. Claim 10 A method of radio reception, the method comprising the steps of: receiving resource allocation information indicating a plurality of resources allocated by a base station apparatus in an uplink; and transmitting data using the plurality of resources in the uplink based on the resource allocation information, wherein the resource allocation information includes indices corresponding to s and e and indicates each resource composed of one or more contiguous RBGs where s represents a start RBG index and e-1 represents an end RBG index.