A mobile communication system comprising: a plurality of base stations (20A, 20B; 31A, 32A, 33A, 31B, 32B, 33B) that are grouped into two or more cell layers, at least a part of each cell (200A, 200B; 310A, 320A, 330A, 310B, 320B, 330B) of the base stations being mutually overlapped, each cell layer including two or more base stations, the two or more base stations included in the two or more cell layers being mutually synchronized in time, a same frequency band being used for radio resources in radio communications between each of the two or more base stations and a mobile station; characterized by: an inter-cell-layer control section for performing an inter-cell adjusting control of radio resources between the two or more cell layers, the radio resources including two or more time slots in radio communications of the same frequency band between each of the two or more base stations and the inter-cell adjusting control including a synchronization control of time slots and an allocation control of time slots in the radio resources of the same frequency band between the two or more cell layers; and two or more intra-cell-layer control sections (40, 50) for performing an inter-cell adjusting control of the radio resources between two or more base stations included in the cell layer for each of the two or more cell layers, the inter-cell adjusting control including the synchronization control of time slots and the allocation control of time slots in the radio resources of the same frequency band between the base stations included in the cell layer for each of the two or more cell layers; wherein the inter-cell-layer control section is configured to transmit first time information designating a start timing of time slot of the radio resource for each of the two or more intra-cell-layer control sections, to each of the two or more intra-cell-layer control sections; and wherein each of the two or more intra-cell-layer control sections is configured to transmit the first time information received from the inter-cell-layer control section, to the two or more base stations included in the cell layer corresponding to the intra-cell-layer control section; wherein the inter-cell-layer control section is configured to transmit identification information designating a time slot to be allocated to the cell layer of the intra-cell-layer control section among two or more time slots forming the radio resource and second time information designating a timing to change the allocation of time slot based on the identification information of time slot, to each of the two or more intra-cell-layer control sections; and wherein each of the two or more intra-cell-layer control sections is configured to transmit the identification information of time slot and the second time information received from the inter-cell-layer control section, to the two or more base stations included in the cell layer corresponding to the intra-cell-layer control section. an inter-cell-layer control section for performing an inter-cell adjusting control of radio resources between the two or more cell layers, the radio resources including two or more time slots in radio communications of the same frequency band between each of the two or more base stations and the inter-cell adjusting control including a synchronization control of time slots and an allocation control of time slots in the radio resources of the same frequency band between the two or more cell layers; and two or more intra-cell-layer control sections (40, 50) for performing an inter-cell adjusting control of the radio resources between two or more base stations included in the cell layer for each of the two or more cell layers, the inter-cell adjusting control including the synchronization control of time slots and the allocation control of time slots in the radio resources of the same frequency band between the base stations included in the cell layer for each of the two or more cell layers; wherein the inter-cell-layer control section is configured to transmit first time information designating a start timing of time slot of the radio resource for each of the two or more intra-cell-layer control sections, to each of the two or more intra-cell-layer control sections; and wherein each of the two or more intra-cell-layer control sections is configured to transmit the first time information received from the inter-cell-layer control section, to the two or more base stations included in the cell layer corresponding to the intra-cell-layer control section; wherein the inter-cell-layer control section is configured to transmit identification information designating a time slot to be allocated to the cell layer of the intra-cell-layer control section among two or more time slots forming the radio resource and second time information designating a timing to change the allocation of time slot based on the identification information of time slot, to each of the two or more intra-cell-layer control sections; and wherein each of the two or more intra-cell-layer control sections is configured to transmit the identification information of time slot and the second time information received from the inter-cell-layer control section, to the two or more base stations included in the cell layer corresponding to the intra-cell-layer control section.